Revert "fix(createdb): use case instead of expr for portability"

This reverts commit 9f1eb5d.

Author: xcompass

lib/createdb.sh

@@ -50,13 +50,12 @@ set_dbuserpass () {
 }
 
 add_granthost () {
-    case "$1" in
-    ""|*[!a-zA-Z0-9.*%_]*)
+    if expr "x$1" : 'x[-a-zA-Z0-9.*%_][-a-zA-Z0-9.*%_]*$' >/dev/null; then
+        granthosts="$granthosts $1"
+    else
         echo "Expected --grant-host=HOSTNAME" 1>&2
-        usage;;
-    *)
-        granthosts="$granthosts $1";;
-    esac
+        usage
+    fi
 }
 
 PROG=$0