Fix pre-push-hook regexes

contrib/verify-commits/pre-push-hook.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-if ! [[ "$2" =~ [git@]?[www.]?github.com[:|/]bitcoin/bitcoin[.git]? ]]; then
+if ! [[ "$2" =~ ^(git@)?(www.)?github.com(:|/)bitcoin/bitcoin(.git)?$ ]]; then
     exit 0
 fi