Regex testers return results but not my site

I have used two testers of regex, and both return the results I want but when ever I go 'Live' I get no results.

Heres the script I'm trying to get working:

$ptn = "/\\x(..)/";
$str = "\x47\x4c\x4f\x42\x41\x4c\x53";
preg_match_all($ptn, $str, $matches, PREG_PATTERN_ORDER);

Anyone know where I'm going wrong?


PHP converts your $str string into its actual characters, you are actually testing the string "GLOBALS".

If you don't want escape sequences to be parsed, use single quotes:

$ptn = '/\\\x([0-9a-f]{2})/i';
$str = '\x47\x4c\x4f\x42\x41\x4c\x53';

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