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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

JavaScript supports the metacharacters and metasequences listed in Table 38 through Table 42. For expanded definitions of each metacharacter, see "Regex Metacharacters, Modes, and Constructs.”

Table 1-38. JavaScript character representations

Sequence

Meaning

\0

Null character, \x00.

\b

Backspace, \x08; supported only in character class.

\n

Newline, \x0A.

\r

Carriage return, \x0D.

\f

Form feed, \x0C.

\t

Horizontal tab, \x09.

\t

Vertical tab, \x0B.

\xhh

Character specified by a two-digit hexadecimal code.

\uhhhh

Character specified by a four-digit hexadecimal code.

\cchar

Named control character.

Table 1-39. JavaScript 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.

.

Any character except a line terminator, [^\x0A\x0D\u2028\u2029].

\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.

\S

Nonwhitespace character.

Table 1-40. JavaScript anchors and other zero-width tests

Sequence

Meaning

^

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

$

End of search string, or the point before a string-ending newline, or before any newline if in multiline match mode, /m.

\b

Word boundary.

\B

Not-word-boundary.

(?=...)

Positive lookahead.

(?!...)

Negative lookahead.

Table 1-41. JavaScript mode modifiers

Modifier

Meaning

m

^ and $ match next to embedded ...

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Publisher Resources

ISBN: 9780596514273Errata Page