What are some resources or websites recommended for testing and understanding regex patterns in PHP?

When working with regular expressions (regex) in PHP, it can be helpful to test and understand the patterns you are using. One recommended resource for testing regex patterns in PHP is regex101.com, which provides a regex tester specifically for PHP. Additionally, the official PHP documentation on regular expressions can be a valuable resource for understanding the syntax and functions available for working with regex in PHP. 

<?php
$pattern = '/[0-9]+/';
$string = '123abc456def';
if (preg_match($pattern, $string, $matches)) {
    echo 'Match found: ' . $matches[0];
} else {
    echo 'No match found.';
}
?>

Keywords

regex patterns testing PHP websites

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