In what ways can online resources like regexpal.com or regex101.com assist PHP developers in testing and refining regular expressions for their projects?

Online resources like regexpal.com or regex101.com can assist PHP developers in testing and refining regular expressions for their projects by providing a platform where developers can input their regular expressions and test them against sample text. These tools offer real-time feedback on matches and highlight any errors in the regular expression, making it easier for developers to debug and refine their patterns. Additionally, they provide explanations for each part of the regular expression, helping developers understand how their patterns work. 

$regex = '/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/';
$email = 'test@example.com';

if (preg_match($regex, $email)) {
    echo 'Valid email address';
} else {
    echo 'Invalid email address';
}

Keywords

regexpal.com regex101.com regular expressions PHP developers testing

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