preg_match in php example

Example 1: preg_match

if(!preg_match('/^\[a-zA-Z]+$/',$input)) {
   // String contains not allowed characters ...
}

Example 2: preg_match in php

<?php
$my_url = "www.guru99.com";
if (preg_match("/guru/", $my_url))
{
	echo "the url $my_url contains guru";
}
else
{
	echo "the url $my_url does not contain guru";
}
?>