   #PHP Manual Regular Expression Functions (Perl-Compatible) preg_match
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                                  preg_quote

   (PHP 3>= 3.0.9, PHP 4 )
   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
   ?>

   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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