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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

PHP supports the metacharacters and metasequences listed in Table 22 through Table 26. For expanded definitions of each metacharacter, see "Regex Metacharacters, Modes, and Constructs.”

Table 1-22. PHP character representations

Sequence

Meaning

\a

Alert (bell), \x07.

\b

Backspace, \x08, supported only in character class.

\e

Esc character, \x1B.

\n

Newline, \x0A.

\r

Carriage return, \x0D.

\f

Form feed, \x0C.

\t

Horizontal tab, \x09.

\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 1-23. PHP 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 (this might corrupt a Unicode character stream, however).

\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 1-24. PHP anchors and zero-width tests

Sequence

Meaning

^

Start of string, or the point after any newline if in multiline match mode, /m.

\A

Start of search string, in all match modes.

$

End of search string, or the point before a string-ending ...

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Publisher Resources

ISBN: 9780596514273Errata Page