regex php

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Daniel
14 Sep 2017
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
source
Raphael
18 Mar 2018
1<?php
2//Syntex : int preg_match( $pattern, $input, $matches, $flags, $offset)
3  
4// Declare a variable and initialize it 
5$str = "Check For Testing."; 
6  
7// case-Insensitive search for the word "Check" 
8if (preg_match("/\bCheck\b/i", $str, $match))  
9    echo "Matched!"; 
10else
11    echo "not matched";   
12  
13
14// Output : Matched
15?>
source
Ida
13 Jun 2016
1if (preg_match("/\bweb\b/i", "PHP is the web scripting language of choice.")) {
2    echo "A match was found.";
3} else {
4    echo "A match was not found.";
5}
source
Mckayla
30 Jun 2016
1if(!preg_match('/^\[a-zA-Z]+$/',$input)) {
2   // String contains not allowed characters ...
3}
source
María
03 Sep 2017
1/\b(stackoverflow)\b/
Louis
11 Apr 2020
1
2ive never used regex expressions till now and had loads of difficulty trying to convert a [url]link here[/url] into an href for use with posting messages on a forum, heres what i manage to come up with:
3
4$patterns = array(
5            "/\[link\](.*?)\[\/link\]/",
6            "/\[url\](.*?)\[\/url\]/",
7            "/\[img\](.*?)\[\/img\]/",
8            "/\[b\](.*?)\[\/b\]/",
9            "/\[u\](.*?)\[\/u\]/",
10            "/\[i\](.*?)\[\/i\]/"
11        );
12        $replacements = array(
13            "<a href=\"\\1\">\\1</a>",
14            "<a href=\"\\1\">\\1</a>",
15            "<img src=\"\\1\">",
16            "<b>\\1</b>",
17            "<u>\\1</u>",
18            "<i>\\1</i>"
19            
20        );
21        $newText = preg_replace($patterns,$replacements, $text);
22
23at first it would collect ALL the tags into one link/bold/whatever, until i added the "?" i still dont fully understand it... but it works :)
24
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