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Apache Struts 2 Documentation
regex validator
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# Description

Validates a string field using a regular expression.

# Parameters

- fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required
- regexp - The RegExp expression
- caseSensitive - Boolean (Optional). Sets whether the expression should be matched against in a case-sensitive way. Default is `true`.
- trim - Boolean (Optional). Sets whether the expression should be trimmed before matching. Default is `true`.
- regexExpression - String (Optional). Defines regExp expression as an OGNL expression - will be evaluated to String
- caseSensitiveExpression - String (Optional). Defines caseSensitive param as an OGNL expression - will be evaluated to Boolean.
- trimExpression - String (Optional). Defines trim param as an OGNL expression - will be evaluated to Boolean

You can mix normal params with expression aware params but thus was not tested

Warning

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Do not use ${regexExpression}, ${caseSensitiveExpression} and ${trimExpression} as an expression as this will turn into infinitive loop!

# Examples