php regular expression

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Lea
28 Mar 2019
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
Nicole
31 Jul 2019
1preg_match('/(foo)(bar)(baz)/', 'foobarbaz', $matches, PREG_OFFSET_CAPTURE);
source
Blue
07 Jan 2020
1
2ive never used regex expressions till now and had loads of difficulty trying to convert a [url]link here[/url] into an href for use with posting messages on a forum, heres what i manage to come up with:
3
4$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
source
Lilly
26 Sep 2018
1Modifier	Description
2i 	Makes the match case insensitive
3m 	Specifies that if the string has newline or carriage
4	return characters, the ^ and $ operators will now
5	match against a newline boundary, instead of a
6	string boundary
7o 	Evaluates the expression only once
8s 	Allows use of . to match a newline character
9x 	Allows you to use white space in the expression for clarity
10g 	Globally finds all matches
11cg 	Allows a search to continue even after a global match fails
12
Anaïs
05 Jun 2019
1A regular expression is a sequence of characters that forms a search pattern.
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