[PHP] regular expression help

[Jason]

Simple functions to check & fix if necessary invalid formating of a MAC 
address... I seem to be having problems with the global variable $mac 
not being returned from the fix_mac() function.  Any help is appreciated.

<?php
/*
 * ex. 00:AA:11:BB:22:CC
 */
function chk_mac( $mac ) {
 if( eregi( 
"^[0-9A-Fa-f]{2}\:[0-9A-Fa-f]{2}\:[0-9A-Fa-f]{2}\:[0-9A-Fa-f]{2}\:[0-9A-Fa-f]{2}\:[0-9A-Fa-f]{2}$", 
$mac ) ) {
  return 0;
 } else {
  return 1;
 }
}

/*
 * check validity of MAC & do replacements if necessary
 */
function fix_mac( $mac ) {
 global $mac;
 /* strip the dash & replace with a colon */
 if( eregi( 
"^[0-9A-Fa-f]{2}\-[0-9A-Fa-f]{2}\-[0-9A-Fa-f]{2}\-[0-9A-Fa-f]{2}\-[0-9A-Fa-f]{2}\-[0-9A-Fa-f]{2}$", 
$mac ) ) {
  $mac = preg_replace( "/\-/", ":", $mac );
  return $mac;
 }
 /* add a colon for every two characters */
 if( eregi( "^[0-9A-Fa-f]{12}$", $mac ) ) {
  /* split up the MAC and assign new var names */
  @list( $mac1, $mac2, $mac3, $mac4, $mac5, $mac6 ) = @str_split( $mac, 
2 );
  /* put it back together with the required colons */
  $mac = $mac1 . ":" . $mac2 . ":" . $mac3 . ":" . $mac4 . ":" . $mac5 
. ":" . $mac6;
  return $mac;
 }
}

// do our checks to make sure we are using these damn things right
$mac1 = "00aa11bb22cc";
$mac2 = "00-aa-11-bb-22-cc";
$mac3 = "00:aa:11:bb:22:cc";
// make sure it is global
global $mac;
// if mac submitted is invalid check & fix if necessary
if( chk_mac( $mac1 ) != 0 ) {
 $mac = fix_mac( $mac1 ); echo $mac1 . " converted to " . $mac . "<br>";
}
if( chk_mac( $mac2 ) != 0 ) {
 $mac = fix_mac( $mac2 ); echo $mac2 . " converted to " . $mac . "<br>";
}
if( chk_mac( $mac3 ) != 0 ) {
 $mac = fix_mac( $mac3 ); echo $mac3 . " converted to " . $mac . "<br>";
}
?>
--
Jason Gerfen
"And remember... If the ladies
 don't find you handsome, they
 should at least find you handy..."
             ~The Red Green show
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