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Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

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//$Id: PatternValidator.java 15765 2009-01-09 14:56:30Z hardy.ferentschik $
package org.hibernate.validator;

import java.io.Serializable;
import java.util.regex.Matcher;

/**
 * check if a given element match the regular expression
 *
 * @author Gavin King
 */
public class PatternValidator implements Validator, Serializable {

	private java.util.regex.Pattern pattern;

	public void initialize(Pattern parameters) {
		pattern = java.util.regex.Pattern.compile(
				parameters.regex(),
				parameters.flags()
		);
	}

	public boolean isValid(Object value) {
		if ( value == null ) return true;
		if ( !( value instanceof String ) ) return false;
		String string = (String) value;
		Matcher m = pattern.matcher( string );
		return m.matches();
	}

}