A syntax checker that simultaneously provides real-time feedback to the user regarding more than one syntactic requirement is disclosed. The syntax checker can be configured by the user to provide feedback about certain rules or rule sets and to omit feedback for other rules or rule sets. Also disclosed is a password validation mechanism that checks a submitted password string against the requirements of more than one password-protected resource and provides visual feedback to the user regarding success or failure. This visual feedback is provided using three different visual cues.