Trim() question

[ballhogjoni]

How do i trim all the characters except for numbers? I assume I use the trim function.

 

Ex:

trim($string, "a-z,~!@#$%^&*()_+`[]{};':"<>?,./|\");

 

Am I missing something?

[Caesar]

<?php

  $str = 'This is a string containing an account#455000455';
  $clean = preg_replace('/[^0-9]+/','',$str);

?>

[ballhogjoni]

thanks,

 

what if I just want the 2 letters FC to be able to show and not be trimmed? How would I do that using your example?

[Caesar]

<?php

  $clean = preg_replace('/[^FC0-9]+/','',$str);

?>

 

...Would allow both numbers and 'F' and 'C'