regex php
<?php
// First Verif your regex code with https://regex101.com/
$str = "Visit W3Schools";
$pattern = "/w3schools/i";
echo preg_match($pattern, $str); // Outputs 1
// test email with REGEX
if (!preg_match("/[-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+.[a-zA-Z]{2,4}/", $emailAddress)){
//Email address is invalid.
}
// use filter var to valide Email
if(filter_var($emailAddress, FILTER_VALIDATE_EMAIL))
{
//The email address is valid.
} else{
//The email address is invalid.
}
?>preg_match in php
<?php
//Syntex : int preg_match( $pattern, $input, $matches, $flags, $offset)
// Declare a variable and initialize it
$str = "Check For Testing.";
// case-Insensitive search for the word "Check"
if (preg_match("/\bCheck\b/i", $str, $match))
echo "Matched!";
else
echo "not matched";
// Output : Matched
?>find substring regx php
if (preg_match("/\bweb\b/i", "PHP is the web scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}preg_match
if(!preg_match('/^\[a-zA-Z]+$/',$input)) {
// String contains not allowed characters ...
}php preg match space or start of string
/\b(stackoverflow)\b/regex php
ive 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:
$patterns = array(
"/\[link\](.*?)\[\/link\]/",
"/\[url\](.*?)\[\/url\]/",
"/\[img\](.*?)\[\/img\]/",
"/\[b\](.*?)\[\/b\]/",
"/\[u\](.*?)\[\/u\]/",
"/\[i\](.*?)\[\/i\]/"
);
$replacements = array(
"<a href=\"\\1\">\\1</a>",
"<a href=\"\\1\">\\1</a>",
"<img src=\"\\1\">",
"<b>\\1</b>",
"<u>\\1</u>",
"<i>\\1</i>"
);
$newText = preg_replace($patterns,$replacements, $text);
at 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 :)Copyright © 2021 Codeinu
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