$re = '/(location=)(.*)(%2C%20TX)/';
$str = '\'https://www.airbnb.com/rooms/18520444?location=Cleveland%2C%20TX\'';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php