PHP在字符串中找到28个字符的十六进制正则表达式

Question

In a very long line, i need to find a regex that matches something like this:

01 02 03 04 05 06 07 08 09 10 11 12 13 14

now, that string is always made of hexadecimal characters, so it can be something like this also:

ab ba 1a 2f 3c 2a 1d 35 32 12 34 78 90 11

only thing that all of them have in common is that they come in 14-pair or 28 character hex values

How can it be done with PHP?

Have tried a few combinations, for example:

preg_match('/[a-f0-9]{2}/i', $data, $matches);

but none that covers all possibilities.

Thanks in advance.

Answer 1

Here's a regex pattern that should match what you should need

(([a-f0-9]{2} ){27}|([a-f0-9]{2} ){13})[a-f0-9]{2}

Example