Re: regular expression in pattern

Martijn Hinten Mon, 22 May 2006 11:54:37 -0700

Hi Carl,

I'm afraid the code that actually /calls/ the validator, is stripping the square brackets, so you can't pass in the regexp you mentioned below. I haven't looked up the code that calls a validator, but I assume it has to do with the syntax of the ognl-_expression_-parsing. The parser is using square brackets to set the boundaries of the total _expression_, so you can't pass those in.

On another thread, I more or less asked the same question, but did not get a reply. This caused me to write my own validator, that /does/ accept square brackets. Well, sort of. It replaces all accolades ( "{" and "}" ) by square brackets. This allows me to use, for example:

        <binding name="validators" value="validators:mzzPattern={a-zA-Z}*"/>
        

or, including a custom error message:

         <binding name="validators" value="validators:mzzPattern={^%}.*[{0} may not start with a '%'.]"/>
        

The code for the validator I wrote is fairly straightforward:

public class PatternValidator extends BaseValidator {

private static final Log log = LogFactory.getLog(PatternValidator.class);

private String pattern;
public void setMzzPattern(String pattern) {
    this.pattern = pattern.replace('{','[').replace('}',']');
}

public void validate(IFormComponent field, ValidationMessages messages, Object object) throws ValidatorException {
    if( log.isDebugEnabled() ) {
      log.debug("Validating input: "+object+" pattern:"+pattern);
    }
    if( object==null ) {
      return;
    }

    if( !Pattern.matches(pattern,object.toString())) {
       if( messageKey==null ) {
         setMessageKey("{0} dos not comply to regExp: "+pattern);
       }
       throw new ValidatorException(buildMessage(messages, field), ValidationConstraint.PATTERN_MISMATCH);
    }
}

}

Hope this helps. Anybody with a better way? Would love to see that too.

Martijn

BTW: you can find the code of Tapestry's pattern validator at: tapestry-4.0.1\framework\src\java\org\apache\tapestry\form\validator\Pattern.java

Carl Pelletier wrote:

Hi everyone, I'm trying to validate a Canadian Postal code in a text field. Can somebody point me to the doc where I can find all the type of pattern supported by pattern= in the validator ?


I search on the forum and get a look at the online doc, but can't find explication on this.

For now, I'm trying to do something like:

<input class="postalCode" maxlength="8" jwcid="[EMAIL PROTECTED]" type="text" value="ognl:address.postalCode" validators="validators:pattern=[A-Z][0-9][A-Z][SPACE][0-9][0-9][A-Z][0-9][%postalCode-format]" displayName="postalCode" />

Thanks for any help ! sorry for the bad english...

P.S. I'm thinking of starting a french version of this forum. Please email me if your think it's a good idea. 

Carl Pelletier

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Re: regular expression in pattern

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