Try this:event.value = event.value.toUpperCase();if(event.value != ""){// validate Canadian postal code;event.rc = /^(?!.*[DFIOQU])[A-VXY][0-9][A-Z][0-9][A-Z][0-9]$/.test(event.value);if(event.rc == false){ app.alert("Please enter a correct Canadian Postal code", 1, 0); this.resetForm([event.target.name]);}}