@@ -2014,7 +2014,7 @@ function cidr2netmask {

 # Check if this is a valid ipv4 address string

 function is_ipv4_address {

     local address=$1

-    local regex='([0-9]{1,3}.){3}[0-9]{1,3}'

+    local regex='([0-9]{1,3}\.){3}[0-9]{1,3}'

     # TODO(clarkb) make this more robust

     if [[ "$address" =~ $regex ]] ; then

         return 0