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<!DOCTYPE html>
<html>
<body>
​
<h1>Regex Modifier: [^eo]</h1>
​
<p>How many letters in the text "Welcome" are not "e" or "o":</p>
​
<?php
$txt = "Welcome";
$pattern = "/[^eo]/";
echo preg_match_all($pattern, $txt);
?>  
​
<p>The matches were found here:</p>
​
<?php
echo preg_replace($pattern, "#", $txt);
?>  
​
<p>(Each match was replaced by a # character)</p>
​
</body>
</html>
​

Regex Modifier: [^eo]

How many letters in the text "Welcome" are not "e" or "o":

4

The matches were found here:

#e##o#e

(Each match was replaced by a # character)