How can substr() be properly used in conjunction with preg_match in PHP?

When using preg_match in PHP to extract a specific substring from a string, you can use substr() to extract the matched substring based on the preg_match result. After preg_match successfully matches the pattern in the string, you can use substr() to extract the desired substring based on the captured group index. 

$string = "Hello, my email is example@example.com";
$pattern = '/([a-zA-Z0-9._%+-]+)@([a-zA-Z0-9.-]+)\.([a-zA-Z]{2,})/';
if (preg_match($pattern, $string, $matches)) {
    $email = substr($matches[0], 0, strpos($matches[0], '@'));
    echo $email; // Output: example
}

Keywords

substr preg_match PHP string manipulation regular expressions

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