Finding a dynamic string (preg_match?)

[Disturbed One]

Hello,

 

If I get a string $str = '(Transaction ID: XXXXXXXXXXXX)';

 

How can I grab the X values? This is a 12 digit alphanumeric value. I believe this is done using preg_match? But I'm not sure exactly how to use this function.

 

Thank you!

[flyhoney]

<?php

$string = '(Transaction ID: 1234567653455)';
preg_match('/Transaction ID: ([\d]+)/', $string, $matches);
print_r($matches);

[Disturbed One]

Thanks! That works great, but only if the Transaction ID is numbers only. How can I do it with numbers and letters?

[thebadbad]

preg_match('/Transaction ID: ([0-9a-z]+)/i', $string, $matches);

 

Edit: But if the string is always written like that, it would be more efficient to use substr():

 

$id = substr($string, 17, 12);

[nrg_alpha]

<?php

$string = '(Transaction ID: 1234567653455)';
preg_match('/Transaction ID: ([\d]+)/', $string, $matches);
print_r($matches);

 

Understand that \d is already a shorthand character class (for [0-9^0-9] exponents in the event your locale supports them), so there would not be any need to encase that inside a character class as you have done. Assuming exponents are not an issue, simply doing (\d+) would have sufficed.