Regular Expressions Cookbook. 2nd Edition - Helion

ebook

Autor: Jan Goyvaerts, Steven Levithan
ISBN: 978-14-493-2748-4
stron: 612, Format: ebook
Data wydania: 2012-08-13
Księgarnia: Helion

Cena książki: 186,15 zł (poprzednio: 216,45 zł)
Oszczędzasz: 14% (-30,30 zł)

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Take the guesswork out of using regular expressions. With more than 140 practical recipes, this cookbook provides everything you need to solve a wide range of real-world problems. Novices will learn basic skills and tools, and programmers and experienced users will find a wealth of detail. Each recipe provides samples you can use right away.

This revised edition covers the regular expression flavors used by C#, Java, JavaScript, Perl, PHP, Python, Ruby, and VB.NET. You’ll learn powerful new tricks, avoid flavor-specific gotchas, and save valuable time with this huge library of practical solutions.

Learn regular expressions basics through a detailed tutorial
Use code listings to implement regular expressions with your language of choice
Understand how regular expressions differ from language to language
Handle common user input with recipes for validation and formatting
Find and manipulate words, special characters, and lines of text
Detect integers, floating-point numbers, and other numerical formats
Parse source code and process log files
Use regular expressions in URLs, paths, and IP addresses
Manipulate HTML, XML, and data exchange formats
Discover little-known regular expression tricks and techniques

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Spis treści

Regular Expressions Cookbook. Detailed Solutions in Eight Programming Languages. 2nd Edition eBook -- spis treści

Regular Expressions Cookbook
SPECIAL OFFER: Upgrade this ebook with OReilly
Preface
- Caught in the Snarls of Different Versions
- Intended Audience
- Technology Covered
- Organization of This Book
- Conventions Used in This Book
- Using Code Examples
- Safari Books Online
- How to Contact Us
- Acknowledgments
1. Introduction to Regular Expressions
- Regular Expressions Defined
  - Many Flavors of Regular Expressions
  - Regex Flavors Covered by This Book
- Search and Replace with Regular Expressions
  - Many Flavors of Replacement Text
- Tools for Working with Regular Expressions
  - RegexBuddy
  - RegexPal
  - RegexMagic
  - More Online Regex Testers
    - RegexPlanet
    - regex.larsolavtorvik.com
    - Nregex
    - Rubular
    - myregexp.com
  - More Desktop Regular Expression Testers
    - Expresso
    - The Regulator
    - SDL Regex Fuzzer
  - grep
    - PowerGREP
    - Windows Grep
    - RegexRenamer
  - Popular Text Editors
2. Basic Regular Expression Skills
- 2.1. Match Literal Text
  - Problem
  - Solution
  - Discussion
  - Variations
    - Block escape
    - Case-insensitive matching
  - See Also
- 2.2. Match Nonprintable Characters
  - Problem
  - Solution
  - Discussion
  - Variations on Representations of Nonprinting Characters
    - The 26 control characters
    - The 7-bit character set
  - See Also
- 2.3. Match One of Many Characters
  - Problem
  - Solution
    - Calendar with misspellings
    - Hexadecimal character
    - Nonhexadecimal character
  - Discussion
  - Variations
    - Shorthands
    - Case insensitivity
  - Flavor-Specific Features
    - .NET character class subtraction
    - Java character class union, intersection, and subtraction
  - See Also
- 2.4. Match Any Character
  - Problem
  - Solution
    - Any character except line breaks
    - Any character including line breaks
  - Discussion
    - Any character except line breaks
    - Any character including line breaks
    - Dot abuse
  - Variations
  - See Also
- 2.5. Match Something at the Start and/or the End of a Line
  - Problem
  - Solution
    - Start of the subject
    - End of the subject
    - Start of a line
    - End of a line
  - Discussion
    - Anchors and lines
    - Start of the subject
    - End of the subject
    - Start of a line
    - End of a line
    - Zero-length matches
  - Variations
  - See Also
- 2.6. Match Whole Words
  - Problem
  - Solution
    - Word boundaries
    - Nonboundaries
  - Discussion
    - Word boundaries
    - Nonboundaries
  - Word Characters
  - See Also
- 2.7. Unicode Code Points, Categories, Blocks, and Scripts
  - Problem
  - Solution
    - Unicode code point
    - Unicode category
    - Unicode block
    - Unicode script
    - Unicode grapheme
  - Discussion
    - Unicode code point
    - Unicode category
    - Unicode block
    - Unicode script
    - Unicode grapheme
  - Variations
    - Negated variant
    - Character classes
    - Listing all characters
  - See Also
- 2.8. Match One of Several Alternatives
  - Problem
  - Solution
  - Discussion
  - See Also
- 2.9. Group and Capture Parts of the Match
  - Problem
  - Solution
  - Discussion
  - Variations
    - Noncapturing groups
    - Group with mode modifiers
  - See Also
- 2.10. Match Previously Matched Text Again
  - Problem
  - Solution
  - Discussion
  - See Also
- 2.11. Capture and Name Parts of the Match
  - Problem
  - Solution
    - Named capture
    - Named backreferences
  - Discussion
    - Named capture
    - Named backreferences
    - Groups with the same name
  - See Also
- 2.12. Repeat Part of the Regex a Certain Number of Times
  - Problem
  - Solution
    - Googol
    - Hexadecimal number
    - Hexadecimal number with optional suffix
    - Floating-point number
  - Discussion
    - Fixed repetition
    - Variable repetition
    - Infinite repetition
    - Making something optional
    - Repeating groups
  - See Also
- 2.13. Choose Minimal or Maximal Repetition
  - Problem
  - Solution
  - Discussion
  - See Also
- 2.14. Eliminate Needless Backtracking
  - Problem
  - Solution
  - Discussion
  - See Also
- 2.15. Prevent Runaway Repetition
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 2.16. Test for a Match Without Adding It to the Overall Match
  - Problem
  - Solution
  - Discussion
    - Lookaround
    - Negative lookaround
    - Different levels of lookbehind
    - Matching the same text twice
    - Lookaround is atomic
  - Alternative to Lookbehind
  - Solution Without Lookbehind
  - See Also
- 2.17. Match One of Two Alternatives Based on a Condition
  - Problem
  - Solution
  - Discussion
  - See Also
- 2.18. Add Comments to a Regular Expression
  - Problem
  - Solution
  - Discussion
    - Free-spacing mode
    - Java has free-spacing character classes
  - Variations
- 2.19. Insert Literal Text into the Replacement Text
  - Problem
  - Solution
  - Discussion
    - When and how to escape characters in replacement text
    - .NET and JavaScript
    - Java
    - PHP
    - Perl
    - Python and Ruby
    - More escape rules for string literals
  - See Also
- 2.20. Insert the Regex Match into the Replacement Text
  - Problem
  - Solution
    - Regular expression
    - Replacement
  - Discussion
  - See Also
- 2.21. Insert Part of the Regex Match into the Replacement Text
  - Problem
  - Solution
    - Regular expression
    - Replacement
  - Discussion
    - Replacements using capturing groups
    - $10 and higher
    - References to nonexistent groups
  - Solution Using Named Capture
    - Regular expression
    - Replacement
    - Flavors that support named capture
  - See Also
- 2.22. Insert Match Context into the Replacement Text
  - Problem
  - Solution
  - Discussion
  - See Also
3. Programming with Regular Expressions
- Programming Languages and Regex Flavors
  - Languages Covered in This Chapter
  - More Programming Languages
- 3.1. Literal Regular Expressions in Source Code
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.2. Import the Regular Expression Library
  - Problem
  - Solution
    - C#
    - VB.NET
    - XRegExp
    - Java
    - Python
  - Discussion
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
- 3.3. Create Regular Expression Objects
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Compiling a Regular Expression Down to CIL
    - C#
    - VB.NET
  - Discussion
  - See Also
- 3.4. Set Regular Expression Options
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Additional Language-Specific Options
    - .NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.5. Test If a Match Can Be Found Within a Subject String
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - C# and VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.6. Test Whether a Regex Matches the Subject String Entirely
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - C# and VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.7. Retrieve the Matched Text
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.8. Determine the Position and Length of the Match
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.9. Retrieve Part of the Matched Text
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Named Capture
    - C#
    - VB.NET
    - Java
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.10. Retrieve a List of All Matches
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.11. Iterate over All Matches
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.12. Validate Matches in Procedural Code
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
  - See Also
- 3.13. Find a Match Within Another Match
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
  - See Also
- 3.14. Replace All Matches
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.15. Replace Matches Reusing Parts of the Match
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Named Capture
    - C#
    - VB.NET
    - Java 7
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.16. Replace Matches with Replacements Generated in Code
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.17. Replace All Matches Within the Matches of Another Regex
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
  - See Also
- 3.18. Replace All Matches Between the Matches of Another Regex
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - Perl and Ruby
    - Python
  - See Also
- 3.19. Split a String
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - C# and VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.20. Split a String, Keeping the Regex Matches
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
    - .NET
    - Java
    - JavaScript
    - XRegExp
    - PHP
    - Perl
    - Python
    - Ruby
  - See Also
- 3.21. Search Line by Line
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - PHP
    - Perl
    - Python
    - Ruby
  - Discussion
  - See Also
- Construct a Parser
  - Problem
  - Solution
    - C#
    - VB.NET
    - Java
    - JavaScript
    - XRegExp
    - Perl
    - Python
    - PHP
    - Ruby
  - Discussion
  - See Also
4. Validation and Formatting
- 4.1. Validate Email Addresses
  - Problem
  - Solution
    - Simple
    - Simple, with restrictions on characters
    - Simple, with all valid local part characters
    - No leading, trailing, or consecutive dots
    - Top-level domain has two to six letters
  - Discussion
    - About email addresses
    - Regular expression syntax
    - Building a regex step-by-step
  - Variations
  - See Also
- 4.2. Validate and Format North American Phone Numbers
  - Problem
  - Solution
    - Regular expression
    - Replacement
    - C# example
    - JavaScript example
    - Other programming languages
  - Discussion
  - Variations
    - Eliminate invalid phone numbers
    - Find phone numbers in documents
    - Allow a leading 1
    - Allow seven-digit phone numbers
  - See Also
- 4.3. Validate International Phone Numbers
  - Problem
  - Solution
    - Regular expression
    - JavaScript example
  - Discussion
  - Variations
    - Validate international phone numbers in EPP format
  - See Also
- 4.4. Validate Traditional Date Formats
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 4.5. Validate Traditional Date Formats, Excluding Invalid Dates
  - Problem
  - Solution
    - C#
    - Perl
    - Pure regular expression
  - Discussion
    - Regex with procedural code
    - Pure regular expression
  - Variations
  - See Also
- 4.6. Validate Traditional Time Formats
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 4.7. Validate ISO 8601 Dates and Times
  - Problem
  - Solution
    - Dates
    - Weeks
    - Times
    - Date and time
    - XML Schema dates and times
  - Discussion
  - See Also
- 4.8. Limit Input to Alphanumeric Characters
  - Problem
  - Solution
    - Regular expression
    - Ruby example
  - Discussion
  - Variations
    - Limit input to ASCII characters
    - Limit input to ASCII noncontrol characters and line breaks
    - Limit input to shared ISO-8859-1 and Windows-1252 characters
    - Limit input to alphanumeric characters in any language
  - See Also
- 4.9. Limit the Length of Text
  - Problem
  - Solution
    - Regular expression
    - Perl example
  - Discussion
  - Variations
    - Limit the length of an arbitrary pattern
    - Limit the number of nonwhitespace characters
    - Limit the number of words
  - See Also
- 4.10. Limit the Number of Lines in Text
  - Problem
  - Solution
    - Regular expression
    - PHP (PCRE) example
  - Discussion
  - Variations
    - Working with esoteric line separators
  - See Also
- 4.11. Validate Affirmative Responses
  - Problem
  - Solution
    - Regular expression
    - JavaScript example
  - Discussion
  - See Also
- 4.12. Validate Social Security Numbers
  - Problem
  - Solution
    - Regular expression
    - Python example
  - Discussion
  - Variations
    - Find Social Security numbers in documents
  - See Also
- 4.13. Validate ISBNs
  - Problem
  - Solution
    - Regular expressions
    - JavaScript example, with checksum validation
    - Python example, with checksum validation
  - Discussion
    - ISBN-10 checksum
    - ISBN-13 checksum
  - Variations
    - Find ISBNs in documents
    - Eliminate incorrect ISBN identifiers
  - See Also
- 4.14. Validate ZIP Codes
  - Problem
  - Solution
    - Regular expression
    - VB.NET example
  - Discussion
  - See Also
- 4.15. Validate Canadian Postal Codes
  - Problem
  - Solution
  - Discussion
  - See Also
- 4.16. Validate U.K. Postcodes
  - Problem
  - Solution
  - Discussion
  - See Also
- 4.17. Find Addresses with Post Office Boxes
  - Problem
  - Solution
    - Regular expression
    - C# example
  - Discussion
  - See Also
- 4.18. Reformat Names From FirstName LastName to LastName, FirstName
  - Problem
  - Solution
    - Regular expression
    - Replacement
    - JavaScript example
  - Discussion
  - Variations
    - List surname particles at the beginning of the name
  - See Also
- 4.19. Validate Password Complexity
  - Problem
  - Solution
    - Length between 8 and 32 characters
    - ASCII visible and space characters only
    - One or more uppercase letters
    - One or more lowercase letters
    - One or more numbers
    - One or more special characters
    - Disallow three or more sequential identical characters
    - Example JavaScript solution, basic
    - Example JavaScript solution, with x out of y validation
    - Example JavaScript solution, with password security ranking
  - Discussion
    - Example JavaScript solutions
  - Variations
    - Validate multiple password rules with a single regex
  - See Also
- 4.20. Validate Credit Card Numbers
  - Problem
  - Solution
    - Strip spaces and hyphens
    - Validate the number
    - Example web page with JavaScript
  - Discussion
    - Strip spaces and hyphens
    - Validate the number
    - Incorporating the solution into a web page
  - Extra Validation with the Luhn Algorithm
  - See Also
- 4.21. European VAT Numbers
  - Problem
  - Solution
    - Strip whitespace and punctuation
    - Validate the number
  - Discussion
    - Strip whitespace and punctuation
    - Validate the number
  - Variations
  - See Also
5. Words, Lines, and Special Characters
- 5.1. Find a Specific Word
  - Problem
  - Solution
  - Discussion
  - See Also
- 5.2. Find Any of Multiple Words
  - Problem
  - Solution
    - Using alternation
    - Example JavaScript solution
  - Discussion
    - Using alternation
    - Example JavaScript solution
  - See Also
- 5.3. Find Similar Words
  - Problem
  - Solution
    - Color or colour
    - Bat, cat, or rat
    - Words ending with phobia
    - Steve, Steven, or Stephen
    - Variations of regular expression
  - Discussion
    - Use word boundaries to match complete words
    - Color or colour
    - Bat, cat, or rat
    - Words ending with phobia
    - Steve, Steven, or Stephen
    - Variations of regular expression
  - See Also
- 5.4. Find All Except a Specific Word
  - Problem
  - Solution
  - Discussion
  - Variations
    - Find words that dont contain another word
  - See Also
- 5.5. Find Any Word Not Followed by a Specific Word
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 5.6. Find Any Word Not Preceded by a Specific Word
  - Problem
  - Solution
    - Lookbehind you
    - Words not preceded by cat
    - Simulate lookbehind
  - Discussion
    - Fixed, finite, and infinite length lookbehind
    - Simulate lookbehind
  - Variations
  - See Also
- 5.7. Find Words Near Each Other
  - Problem
  - Solution
  - Discussion
  - Variations
    - Using a conditional
    - Match three or more words near each other
      - Exponentially increasing permutations
      - The ugly solution
      - Exploiting empty backreferences
      - JavaScript backreferences by its own rules
    - Multiple words, any distance from each other
  - See Also
- 5.8. Find Repeated Words
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 5.9. Remove Duplicate Lines
  - Problem
  - Solution
    - Option 1: Sort lines and remove adjacent duplicates
    - Option 2: Keep the last occurrence of each duplicate line in an unsorted file
    - Option 3: Keep the first occurrence of each duplicate line in an unsorted file
  - Discussion
    - Option 1: Sort lines and remove adjacent duplicates
    - Option 2: Keep the last occurrence of each duplicate line in an unsorted file
    - Option 3: Keep the first occurrence of each duplicate line in an unsorted file
  - See Also
- 5.10. Match Complete Lines That Contain a Word
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 5.11. Match Complete Lines That Do Not Contain a Word
  - Problem
  - Solution
  - Discussion
  - See Also
- 5.12. Trim Leading and Trailing Whitespace
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- 5.13. Replace Repeated Whitespace with a Single Space
  - Problem
  - Solution
    - Clean any whitespace characters
    - Clean horizontal whitespace characters
  - Discussion
    - Clean any whitespace characters
    - Clean horizontal whitespace characters
  - See Also
- 5.14. Escape Regular Expression Metacharacters
  - Problem
  - Solution
    - Built-in solutions
    - Regular expression
    - Replacement
    - Example JavaScript function
  - Discussion
  - Variations
  - See Also
6. Numbers
- 6.1. Integer Numbers
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.2. Hexadecimal Numbers
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.3. Binary Numbers
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.4. Octal Numbers
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.5. Decimal Numbers
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.6. Strip Leading Zeros
  - Problem
  - Solution
    - Regular expression
    - Replacement
    - Getting the numbers in Perl
    - Stripping leading zeros in PHP
  - Discussion
  - See Also
- 6.7. Numbers Within a Certain Range
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.8. Hexadecimal Numbers Within a Certain Range
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.9. Integer Numbers with Separators
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.10. Floating-Point Numbers
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.11. Numbers with Thousand Separators
  - Problem
  - Solution
  - Discussion
  - See Also
- 6.12. Add Thousand Separators to Numbers
  - Problem
  - Solution
    - Basic solution
    - Match separator positions only, using lookbehind
  - Discussion
    - Introduction
    - Basic solution
    - Match separator positions only, using lookbehind
  - Variations
    - Dont add commas after a decimal point
      - Use infinite lookbehind
      - Search-and-replace within matched numbers
  - See Also
- 6.13. Roman Numerals
  - Problem
  - Solution
  - Discussion
  - Convert Roman Numerals to Decimal
  - See Also
7. Source Code and Log Files
- Keywords
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- Identifiers
  - Problem
  - Solution
  - Discussion
  - See Also
- Numeric Constants
  - Problem
  - Solution
  - Discussion
  - See Also
- Operators
  - Problem
  - Solution
  - Discussion
- Single-Line Comments
  - Problem
  - Solution
  - Discussion
  - See Also
- Multiline Comments
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- All Comments
  - Problem
  - Solution
  - Discussion
  - See Also
- Strings
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- Strings with Escapes
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- Regex Literals
  - Problem
  - Solution
  - Discussion
  - See Also
- Here Documents
  - Problem
  - Solution
  - Discussion
  - See Also
- Common Log Format
  - Problem
  - Solution
  - Discussion
  - Variations
  - See Also
- Combined Log Format
  - Problem
  - Solution
  - Discussion
  - See Also
- Broken Links Reported in Web Logs
  - Problem
  - Solution
  - Discussion
  - See Also
8. URLs, Paths, and Internet Addresses
- 8.1. Validating URLs
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.2. Finding URLs Within Full Text
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.3. Finding Quoted URLs in Full Text
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.4. Finding URLs with Parentheses in Full Text
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.5. Turn URLs into Links
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.6. Validating URNs
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.7. Validating Generic URLs
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.8. Extracting the Scheme from a URL
  - Problem
  - Solution
    - Extract the scheme from a URL known to be valid
    - Extract the scheme while validating the URL
  - Discussion
  - See Also
- 8.9. Extracting the User from a URL
  - Problem
  - Solution
    - Extract the user from a URL known to be valid
    - Extract the user while validating the URL
  - Discussion
  - See Also
- 8.10. Extracting the Host from a URL
  - Problem
  - Solution
    - Extract the host from a URL known to be valid
    - Extract the host while validating the URL
  - Discussion
  - See Also
- 8.11. Extracting the Port from a URL
  - Problem
  - Solution
    - Extract the port from a URL known to be valid
    - Extract the port while validating the URL
  - Discussion
  - See Also
- 8.12. Extracting the Path from a URL
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.13. Extracting the Query from a URL
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.14. Extracting the Fragment from a URL
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.15. Validating Domain Names
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.16. Matching IPv4 Addresses
  - Problem
  - Solution
    - Regular expression
    - Perl
  - Discussion
  - See Also
- 8.17. Matching IPv6 Addresses
  - Problem
  - Solution
    - Standard notation
    - Mixed notation
    - Standard or mixed notation
    - Compressed notation
    - Compressed mixed notation
    - Standard, mixed, or compressed notation
  - Discussion
    - Standard notation
    - Mixed notation
    - Standard or mixed notation
    - Compressed notation
    - Compressed mixed notation
    - Standard, mixed, or compressed notation
  - See Also
- 8.18. Validate Windows Paths
  - Problem
  - Solution
    - Drive letter paths
    - Drive letter and UNC paths
    - Drive letter, UNC, and relative paths
  - Discussion
    - Drive letter paths
    - Drive letter and UNC paths
    - Drive letter, UNC, and relative paths
  - See Also
- 8.19. Split Windows Paths into Their Parts
  - Problem
  - Solution
    - Drive letter paths
    - Drive letter and UNC paths
    - Drive letter, UNC, and relative paths
  - Discussion
    - Drive letter paths
    - Drive letter and UNC paths
    - Drive letter, UNC, and relative paths
  - See Also
- 8.20. Extract the Drive Letter from a Windows Path
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.21. Extract the Server and Share from a UNC Path
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.22. Extract the Folder from a Windows Path
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.23. Extract the Filename from a Windows Path
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.24. Extract the File Extension from a Windows Path
  - Problem
  - Solution
  - Discussion
  - See Also
- 8.25. Strip Invalid Characters from Filenames
  - Problem
  - Solution
    - Regular expression
    - Replacement
  - Discussion
  - See Also
9. Markup and Data Formats
- Processing Markup and Data Formats with Regular Expressions
 - Basic Rules for Formats Covered in This Chapter
- 9.1. Find XML-Style Tags
 - Problem
 - Solution
 - Quick and dirty
 - Allow > in attribute values
 - (X)HTML tags (loose)
 - (X)HTML tags (strict)
 - XML tags (strict)
 - Discussion
 - A few words of caution
 - Quick and dirty
 - Allow > in attribute values
 - (X)HTML tags (loose)
 - (X)HTML tags (strict)
 - XML tags (strict)
 - Skip Tricky (X)HTML and XML Sections
 - Outer regex for (X)HTML
 - Outer regex for XML
 - See Also
- 9.2. Replace Tags with 
 - Problem
 - Solution
 - Discussion
 - Variations
 - Replace a list of tags
 - See Also
- 9.3. Remove All XML-Style Tags Except and 
 - Problem
 - Solution
 - Solution 1: Match tags except and 
 - Solution 2: Match tags except and , and any tags that contain attributes
 - Discussion
 - Variations
 - Whitelist specific attributes
 - See Also
- 9.4. Match XML Names
 - Problem
 - Solution
 - XML 1.0 names (approximate)
 - XML 1.1 names (exact)
 - Discussion
 - XML 1.0 names
 - XML 1.1 names
 - Variations
 - See Also
- 9.5. Convert Plain Text to HTML by Adding and Tags
 - Problem
 - Solution
 - Step 1: Replace HTML special characters with named character references
 - Step 2: Replace all line breaks with 
 - Step 3: Replace double tags with 
 - Step 4: Wrap the entire string with 
 - Example JavaScript solution
 - Discussion
 - Step 1: Replace HTML special characters with named character references
 - Step 2: Replace all line breaks with 
 - Step 3: Replace double tags with 
 - Step 4: Wrap the entire string with 
 - See Also
- 9.6. Decode XML Entities
 - Problem
 - Solution
 - Regular expression
 - Replace matches with their corresponding literal characters
 - Example JavaScript solution
 - Discussion
 - See Also
- 9.7. Find a Specific Attribute in XML-Style Tags
 - Problem
 - Solution
 - Tags that contain an id attribute (quick and dirty)
 - Tags that contain an id attribute (more reliable)
 - <div> tags that contain an id attribute
 - Tags that contain an id attribute with the value my-id
 - Tags that contain my-class within their class attribute value
 - Discussion
 - See Also
- 9.8. Add a cellspacing Attribute to <table> Tags That Do Not Already Include It
 - Problem
 - Solution
 - Solution 1, simplistic
 - Solution 2, more reliable
 - Insert the new attribute
 - Discussion
 - See Also
- 9.9. Remove XML-Style Comments
 - Problem
 - Solution
 - Discussion
 - How it works
 - When comments cant be removed
 - Variations
 - Find valid XML comments
 - Find valid HTML comments
 - See Also
- 9.10. Find Words Within XML-Style Comments
 - Problem
 - Solution
 - Two-step approach
 - Single-step approach
 - Discussion
 - Two-step approach
 - Single-step approach
 - Variations
 - See Also
- 9.11. Change the Delimiter Used in CSV Files
 - Problem
 - Solution
 - Example web page with JavaScript
 - Discussion
 - See Also
- 9.12. Extract CSV Fields from a Specific Column
 - Problem
 - Solution
 - Example web page with JavaScript
 - Discussion
 - Variations
 - Match a CSV record and capture the field in column 1 to backreference 1
 - Match a CSV record and capture the field in column 2 to backreference 1
 - Match a CSV record and capture the field in column 3 or higher to backreference 1
 - Replacement string
 - See Also
- 9.13. Match INI Section Headers
 - Problem
 - Solution
 - Discussion
 - Variations
 - See Also
- 9.14. Match INI Section Blocks
 - Problem
 - Solution
 - Discussion
 - See Also
- 9.15. Match INI Name-Value Pairs
 - Problem
 - Solution
 - Discussion
 - See Also
Index
About the Authors
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