(PHP 4, PHP 5, PHP 7)
Quote regular expression characters
string preg_quote ( string $str [, string $delimiter = NULL ] )
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.
The special regular expression characters are: . \ + * ? [ ^ ] $ ( ) { } = ! < > | : -
Parameters:
str
The input string.
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.
Returns:
Returns the quoted (escaped) string.
Changelog:
5.3.0
The - character is now quoted
Notes:
This function is binary-safe.
Examples:
preg_quote() example
<?php $keywords = '$40 for a g3/400'; $keywords = preg_quote($keywords, '/'); echo $keywords; // returns \$40 for a g3\/400 ?>
Italicizing a word within some text
<?php // In this example, preg_quote($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); ?>
See also:
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