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Regex

Table of Contents

1. Overview
2. Regular Expression Syntax

2.1 Syntax Bits
2.2 Predefined Syntaxes
2.3 Collating Elements vs. Characters
2.4 The Backslash Character

3. Common Operators

3.1 The Match-self Operator (ordinary character)
3.2 The Match-any-character Operator (.)
3.3 The Concatenation Operator
3.4 Repetition Operators

3.4.1 The Match-zero-or-more Operator (*)
3.4.2 The Match-one-or-more Operator (+ or \+)
3.4.3 The Match-zero-or-one Operator (? or \?)
3.4.4 Interval Operators ({ ... } or \{ ... \})

3.5 The Alternation Operator (| or \|)
3.6 List Operators ([ ... ] and [^ ... ])

3.6.1 Character Class Operators ([: ... :])
3.6.2 The Range Operator (-)

3.7 Grouping Operators (( ... ) or \( ... \))
3.8 The Back-reference Operator (\digit)
3.9 Anchoring Operators

3.9.1 The Match-beginning-of-line Operator (^)
3.9.2 The Match-end-of-line Operator ($)

4. GNU Operators

4.1 Word Operators

4.1.1 Non-Emacs Syntax Tables
4.1.2 The Match-word-boundary Operator (\b)
4.1.3 The Match-within-word Operator (\B)
4.1.4 The Match-beginning-of-word Operator (\<)
4.1.5 The Match-end-of-word Operator (\>)
4.1.6 The Match-word-constituent Operator (\w)
4.1.7 The Match-non-word-constituent Operator (\W)

4.2 Buffer Operators

4.2.1 The Match-beginning-of-buffer Operator (\`)
4.2.2 The Match-end-of-buffer Operator (\')

5. GNU Emacs Operators

5.1 Syntactic Class Operators

5.1.1 Emacs Syntax Tables
5.1.2 The Match-syntactic-class Operator (\sclass)
5.1.3 The Match-not-syntactic-class Operator (\Sclass)

6. What Gets Matched?
7. Programming with Regex

7.1 GNU Regex Functions

7.1.1 GNU Pattern Buffers
7.1.2 GNU Regular Expression Compiling
7.1.3 GNU Matching
7.1.4 GNU Searching
7.1.5 Matching and Searching with Split Data
7.1.6 Searching with Fastmaps
7.1.7 GNU Translate Tables
7.1.8 Using Registers
7.1.9 Freeing GNU Pattern Buffers

7.2 POSIX Regex Functions

7.2.1 POSIX Pattern Buffers
7.2.2 POSIX Regular Expression Compiling
7.2.3 POSIX Matching
7.2.4 Reporting Errors
7.2.5 Using Byte Offsets
7.2.6 Freeing POSIX Pattern Buffers

7.3 BSD Regex Functions

7.3.1 BSD Regular Expression Compiling
7.3.2 BSD Searching

A. GNU GENERAL PUBLIC LICENSE

Preamble
Appendix: How to Apply These Terms to Your New Programs

Index