Detect if a string is a data URL (PHP, JS)

onJSClient.js

// For js more info in source: https://gist.github.com/bgrins/6194623

function isDataURL(s) {
    return !!s.match(isDataURL.regex);
}
isDataURL.regex = /^\s*data:([a-z]+\/[a-z]+(;[a-z\-]+\=[a-z\-]+)?)?(;base64)?,[a-z0-9\!\$\&\'\,\(\)\*\+\,\;\=\-\.\_\~\:\@\/\?\%\s]*\s*$/i;

onPhpServer.php

<?php

function isDataURL($s){
    if ( preg_match(" /^\s*data:([a-z]+\/[a-z]+(;[a-z\-]+\=[a-z\-]+)?)?(;base64)?,[a-z0-9\!\$\&\'\,\(\)\*\+\,\;\=\-\.\_\~\:\@\/\?\%\s]*\s*$/i", $s) ){
        return true;
    }
    
    return false;
}