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<!DOCTYPE html>
<html>
<body>
​
<h1>Regex Modifier: ^W3</h1>
​
<p>Does the text "W3Schools", start with "W3"?:</p>
​
<?php
$txt = "W3Schools";
$pattern = "/^W3/";
echo preg_match_all($pattern, $txt);
?>  
​
<p>This method returns 1 if there is a match, otherwise 0.</p>
​
<p>The matches were found here:</p>
​
<?php
echo preg_replace($pattern, "#", $txt);
?>  
​
<p>(The match was replaced by a # character)</p>
​
</body>
</html>
​

Regex Modifier: ^W3

Does the text "W3Schools", start with "W3"?:

1

This method returns 1 if there is a match, otherwise 0.

The matches were found here:

#Schools

(The match was replaced by a # character)