| Home > Guides > Core Developers Guide > Annotations > ExpressionValidator Annotation |
This non-field level validator validates a supplied regular expression.
The annotation must be applied at method level.
| Parameter | Required | Default | Notes |
|---|---|---|---|
| message | yes | field error message | |
| key | no | i18n key from language specific properties file. | |
| messageParams | no | Additional params to be used to customize message - will be evaluated against the Value Stack | |
| shortCircuit | no | false | If this validator should be used as shortCircuit. |
| expression | yes | An OGNL expression that returns a boolean value. |