what is a regular expression in php

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Amberly
07 Oct 2020
1<?php
2// First Verif your regex code with https://regex101.com/
3$str = "Visit W3Schools";
4$pattern = "/w3schools/i";
5echo preg_match($pattern, $str); // Outputs 1
6
7// test email with REGEX
8if (!preg_match("/[-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+.[a-zA-Z]{2,4}/", $emailAddress)){
9    //Email address is invalid.
10}
11
12// use filter var to valide Email
13if(filter_var($emailAddress, FILTER_VALIDATE_EMAIL)) 
14{
15     //The email address is valid.
16} else{
17     //The email address is invalid.
18}
19
20
21?>
22
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Clarisse
31 Apr 2019
1preg_match('/(foo)(bar)(baz)/', 'foobarbaz', $matches, PREG_OFFSET_CAPTURE);
Jerald
26 Apr 2016
1A regular expression is a sequence of characters that forms a search pattern.
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