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https://issues.apache.org/jira/browse/TAPESTRY-572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12508023
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Paul Ferraro commented on TAPESTRY-572:
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I think what you're looking for is the Pattern validator which validates a
string against a regular expression.
http://tapestry.apache.org/tapestry4.1/apidocs/org/apache/tapestry/form/validator/Pattern.html
Something like this perhaps?
<binding name="validators" value="validators:pattern=\d+"/>
> NumberValidator should accept Strings
> -------------------------------------
>
> Key: TAPESTRY-572
> URL: https://issues.apache.org/jira/browse/TAPESTRY-572
> Project: Tapestry
> Issue Type: Bug
> Components: Framework
> Affects Versions: 4.0
> Reporter: Kevin J. Menard, Jr.
> Priority: Minor
> Fix For: 4.1.2
>
>
> Applying NumberValidator to a TextField will allow a number to be validated
> as a number and stored as a String. However, NumberValidator is not able to
> take a String and display it as a number. I think this should be a
> bidirectional process. An example of where this would be useful is the
> following:
> I'd like to store a number as a String so I don't lose any prepending 0's
> (which RDBMSs love to throw out) when persisting the data. However, I do
> want to ensure that only a number is valid input.
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