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Regular Expression Pocket Reference, 2nd Edition
book

Regular Expression Pocket Reference, 2nd Edition

by Tony Stubblebine
July 2007
Intermediate to advanced content levelIntermediate to advanced
128 pages
2h 39m
English
O'Reilly Media, Inc.
Content preview from Regular Expression Pocket Reference, 2nd Edition

Supported Metacharacters

Apache supports the metacharacters and metasequences listed in Table 48 through Table 52. For expanded definitions of each metacharacter, see "Regex Metacharacters, Modes, and Constructs.”

Table 1-48. Apache character representations

Sequence

Meaning

\octal

Character specified by a three-digit octal code.

\xhex

Character specified by a one- or two-digit hexadecimal code.

\x{hex}

Character specified by any hexadecimal code.

\cchar

Named control character.

Table 1-49. Apache character classes and class-like constructs

Class

Meaning

[...]

A single character listed, or contained within a listed range.

[^...]

A single character not listed, and not contained within a listed range.

[:class:]

POSIX-style character class (valid only within a regex character class).

.

Any character, except newline (unless single-line mode, /s).

\C

One byte; however, this may corrupt a Unicode character stream.

\w

Word character, [a-zA-z0-9_].

\W

Nonword character, [^a-zA-z0-9_].

\d

Digit character, [0-9].

\D

Nondigit character, [^0-9].

\s

Whitespace character, [\n\r\f\t ].

\S

Nonwhitespace character, [^\n\r\f\t ].

Table 1-50. Apache anchors and zero-width tests

Sequence

Meaning

^

Start of string.

$

End of search string.

\b

Word boundary; position between a word character (\w) and a nonword character (\W), the start of the string, or the end of the string.

\B

Not-word-boundary.

(?=...)

Positive lookahead.

(?!...)

Negative lookahead.

(?<=...)

Positive lookbehind.

(?<!...)

Negative lookbehind.

Table 1-51. Apache comments and mode modifiers ...

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Publisher Resources

ISBN: 9780596514273Errata Page