Fix substr mistake

Made a silly mistake and overlooked an important difference between javascript substring() and php substr().
Tightened regex check for octal value.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/usr/local/sbin/prefixes.php b/src/usr/local/sbin/prefixes.php
index 048fc11..8ad1ec4 100644
--- a/src/usr/local/sbin/prefixes.php
+++ b/src/usr/local/sbin/prefixes.php
@@ -119,7 +119,7 @@ function extract_duid($ia_string) {
 				continue;
 			}
 			else if ($len - $i >= 4) {
-				if (preg_match('/[0-7]{3}/', substr($ia_string, $i+1, $i+4))) {
+				if (preg_match('/[0-3][0-7]{2}/', substr($ia_string, $i+1, 3))) {
 					$i += 3;
 					continue;
 				}