What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.



preg_match — Performs the regular expression match against the specified string.


int preg_match(pattern, subject[, matches]);
string pattern: Regex pattern to match
string subject: String to search using the pattern
array matches (optional): Array in which to store the search results


1 if a match is found; 0 otherwise


This function tries to find the first match for the regular expression pattern in the supplied subject string. If the matches parameter is supplied, it should be a valid variable, such as $matches, since the function forces it to be passed by reference. Existing contents of this variable are overwritten with the results of the successful search. $matches[0] contains the text from the subject string that matched the full pattern; the rest of the entries have the pieces of the subject string matching the parenthesized subpatterns.

If it's necessary to find all matches instead of just one, use preg_match_all() instead.


Existing since version 3.0.9


Example 1128. Check whether a filename ends in .txt or.doc

if (preg_match('!\.(doc|txt)$!', $filename)) {
   // it does
else {
   // it doesn't

Example 1129. Capture the price from user input

if (preg_match('/\$(\d+\.\d{1,2}\b|\.\d{1,2}\b|\d+(?!\.))/', $input, $match)) {
   $price = $match[1];
   echo "Entered price was: $price\n";
else {
   echo "Could not find a valid price\n";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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