preg_quote
(PHP 3>= 3.0.9, PHP 4 , PHP 5)
preg_quote -- Quote regular expression characters
Description
string
preg_quote ( string str [, string delimiter])
preg_quote() 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.
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.
The special regular expression characters are:
. \\ + * ? [ ^ ] $ ( ) { } = ! < > | :
Example 1. preg_quote() example
<?php
$keywords = "$40 for a g3/400";
$keywords = preg_quote($keywords, "/");
echo $keywords; // returns \$40 for a g3\/400
?>
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Example 2. Italicizing a word within some text
<?php
// In this example, preg_quote($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);
?>
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Note: This function is
binary-safe.