What tools or resources can be helpful for testing and debugging regular expressions in PHP?

Testing and debugging regular expressions in PHP can be challenging due to the complexity of regex patterns. To make this process easier, developers can utilize online regex testers such as regex101.com or RegExr, which allow you to input your regular expression and test it against sample strings. Additionally, PHP provides the `preg_match()` function which can be used to test regular expressions within your PHP code. 

$pattern = '/[0-9]+/';
$string = 'abc123def';

if (preg_match($pattern, $string)) {
    echo 'Match found!';
} else {
    echo 'No match found.';
}

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