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-rw-r--r--system/libraries/Form_validation.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 11f98f2a9..7be0b949d 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -1294,7 +1294,7 @@ class CI_Form_validation {
if ( ! is_php('5.5'))
{
// Most common format, with either dash or colon delimiters
- if (preg_match('#\A[0-9a-f]{2}(?<delimiter>[:-])([0-9a-f]{2}((?P=delimiter)|\z)){5}#i', $mac))
+ if (preg_match('#\A[0-9a-f]{2}(?<delimiter>[:-])([0-9a-f]{2}(?P=delimiter)){4}[0-9a-f]{2}\z#i', $mac))
{
return TRUE;
}