PHP exact match between input and regex pattern -


i'm trying build check reliably evaluates whether input ($f_username) mac address via regex 'cause there different syntax take. upon finding match. should transferred lowercase without deliminators.

the function works fine in matching , transforming input, wrongly match longer input... e.g. 11-22-33-44-55-66-77-88 transferred 11-22-33-44-55-66 , $match set true...

this should cause function go "else branch" is not exact match of pattern... contains match... have idea how match ?

thanks taking time read , in advance answers :) 

function username_check($f_username) {   global $match;   if (preg_match_all("/([0-9a-fa-f]{2})[^0-9a-fa-f]?([0-9a-fa-f]{2})[^0-9a-fa-f]?([0-9a-fa-f]{2})[^0-9a-fa-f]?([0-9a-fa-f]{2})[^0-9a-fa-f]?([0-9a-fa-f]{2})[^0-9a-fa-f]?([0-9a-fa-f]{2})/", $f_username, $output, preg_pattern_order)) {     ($i = 1; $i <= 6; $i++) {       $new_username .= strtolower($output[$i][0]);     }     $match = true;     $new_username = "'" . $new_username . "'"; //for later use in sql-query   } else {     $match = false;   }   return $new_username; }

i recommend using the regex answer, ensures well-formed mac-address. if want add spaces list of delimiters, replace [-:] [: -].

you experiencing problem described because haven't bound regex start, or end of string. means long there's match somewhere inside string it's valid match.
bind start of string, use ^ after opening delimiter. bind @ end of string, recommend* using \z before closing delimiter.

* reason recommend \z on $, in php, because latter allow newline after match. means string "testing\n" match pattern bound $, not 1 bound \z. of times not want newline.


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