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preg_quote(3) [php man page]

PREG_QUOTE(3)								 1							     PREG_QUOTE(3)

preg_quote - Quote regular expression characters

string preg_quote NULL (string $str, [string $delimiter]) DESCRIPTION
preg_quote(3) takes $str and puts a backslash in front of every character that is part of the regular expression syntax. This is useful if you have a run-time string that you need to match in some text and the string may contain special regex characters. The special regular expression characters are: . + * ? [ ^ ] $ ( ) { } = ! < > | : - PARAMETERS
o $str - The input string. o $delimiter - If the optional $delimiter is specified, it will also be escaped. This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter. RETURN VALUES
Returns the quoted (escaped) string. CHANGELOG
+--------+--------------------------------+ |Version | | | | | | | Description | | | | +--------+--------------------------------+ | 5.3.0 | | | | | | | The - character is now quoted | | | | +--------+--------------------------------+ EXAMPLES
Example #1 preg_quote(3) example <?php $keywords = '$40 for a g3/400'; $keywords = preg_quote($keywords, '/'); echo $keywords; // returns $40 for a g3/400 ?> Example #2 Italicizing a word within some text <?php // In this example, preg_quote($word) is used to keep the // asterisks from having special meaning to the regular // expression. $textbody = "This book is *very* difficult to find."; $word = "*very*"; $textbody = preg_replace ("/" . preg_quote($word, '/') . "/", "<i>" . $word . "</i>", $textbody); ?> NOTES
Note This function is binary-safe. SEE ALSO
PCRE Patterns, escapeshellcmd(3). PHP Documentation Group PREG_QUOTE(3)

Check Out this Related Man Page

REGEXP(6)							   Games Manual 							 REGEXP(6)

regexp - regular expression notation DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular expressions the word `character' means any character (rune) but newline. The syntax for a regular expression e0 is e3: literal | charclass | '.' | '^' | '$' | '(' e0 ')' e2: e3 | e2 REP REP: '*' | '+' | '?' e1: e2 | e1 e2 e0: e1 | e0 '|' e1 A literal is any non-metacharacter, or a metacharacter (one of .*+?[]()|^$), or the delimiter preceded by A charclass is a nonempty string s bracketed [s] (or [^s]); it matches any character in (or not in) s. A negated character class never matches newline. A substring a-b, with a and b in ascending order, stands for the inclusive range of characters between a and b. In s, the metacharacters an initial and the regular expression delimiter must be preceded by a other metacharacters have no special meaning and may appear unescaped. A matches any character. A matches the beginning of a line; matches the end of the line. The REP operators match zero or more (*), one or more (+), zero or one (?), instances respectively of the preceding regular expression e2. A concatenated regular expression, e1e2, matches a match to e1 followed by a match to e2. An alternative regular expression, e0|e1, matches either a match to e0 or a match to e1. A match to any part of a regular expression extends as far as possible without preventing a match to the remainder of the regular expres- sion. SEE ALSO
awk(1), ed(1), sam(1), sed(1), regexp(2) REGEXP(6)

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