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Update user guide for shorthand character classes

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Josh Holtrop 2025-07-26 21:34:22 -04:00
parent 5486e5f138
commit 69aa3097c3
1 changed files with 7 additions and 4 deletions
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doc/user_guide.md
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@ -435,7 +435,7 @@ Example:
/#.*/ /#.*/
``` ```
Regular expressions can include many special characters: Regular expressions can include many special characters/sequences:
* The `.` character matches any input character other than a newline. * The `.` character matches any input character other than a newline.
* The `*` character matches any number of the previous regex element. * The `*` character matches any number of the previous regex element.
@ -447,14 +447,17 @@ Regular expressions can include many special characters:
* The `\` character escapes the following character and changes its meaning: * The `\` character escapes the following character and changes its meaning:
* The `\a` sequence matches an ASCII bell character (0x07). * The `\a` sequence matches an ASCII bell character (0x07).
* The `\b` sequence matches an ASCII backspace character (0x08). * The `\b` sequence matches an ASCII backspace character (0x08).
* The `\d` sequence matches any character `0` through `9`. * The `\d` sequence is shorthand for the `[0-9]` character class.
* The `\D` sequence matches every code point not matched by `\d`.
* The `\f` sequence matches an ASCII form feed character (0x0C). * The `\f` sequence matches an ASCII form feed character (0x0C).
* The `\n` sequence matches an ASCII new line character (0x0A). * The `\n` sequence matches an ASCII new line character (0x0A).
* The `\r` sequence matches an ASCII carriage return character (0x0D). * The `\r` sequence matches an ASCII carriage return character (0x0D).
* The `\s` sequence matches a space, horizontal tab `\t`, carriage return * The `\s` sequence is shorthand for the `[ \t\r\n\f\v]` character class.
`\r`, a form feed `\f`, or a vertical tab `\v` character. * The `\S` sequence matches every code point not matched by `\s`.
* The `\t` sequence matches an ASCII tab character (0x09). * The `\t` sequence matches an ASCII tab character (0x09).
* The `\v` sequence matches an ASCII vertical tab character (0x0B). * The `\v` sequence matches an ASCII vertical tab character (0x0B).
* The `\w` sequence is shorthand for the `[a-zA-Z0-9_]` character class.
* The `\W` sequence matches every code point not matched by `\w`.
* Any other character matches itself. * Any other character matches itself.
* The `|` character creates an alternate match. * The `|` character creates an alternate match.