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    <p>As Vlad said, i also think in tapestry there is no integrated regexp check in the markup, see in this <a href="http://tapestry.apache.org/tapestry4/UsersGuide/validation.html" rel="nofollow">link</a> at the end the supported validators(But maybe there is in the version you are ussing, not really sure about that).</p> <p>Maybe you could try somehow to use the onValidate lifeCycle event handler, to validate that field against a wrong input.</p> <pre><code>@Component private Form yourForm; @Property private String inputFromField; public void onValidate() { Pattern p = Pattern.compile("^[a-zA-Z0-9]+$");//Alpha numeric regexp Matcher m = p.matcher(inputFromField); if(m.find()) { yourForm.recordError(inputFromField,messages.get("This field can only contain letters and numbers")); } } </code></pre> <p>Anyway, Im sure there is more than one way of how to do this, but this is just an example. I didnt compile and try it, but im pretty sure this is the one of the ways that can be done. If you need more help, have a look at this page: <a href="http://www.packtpub.com/article/user-input-validation-in-tapestry-5" rel="nofollow">http://www.packtpub.com/article/user-input-validation-in-tapestry-5</a></p> <p>Remember to add the tag to your form.</p> <p><strong>Update</strong></p> <p>I was wrong when i said that it is not possible to use the regexp directly in the markup. After having a look at Heanning's link, i saw that there is the possibility of using the regexp directly as you planned. Example:</p> <pre><code>&lt;t:textfield value="otherfield" validate="regexp=^a-z+$" /&gt; </code></pre> <p>I would recommend you to have a look at the link he said, it is well explained there(For Tapestry 5): <a href="http://tapestry.apache.org/forms-and-validation.html" rel="nofollow">http://tapestry.apache.org/forms-and-validation.html</a></p>
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    1. POhow to make regexp for passwordfield on beaneditform?
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    1. POhow to make regexp for passwordfield on beaneditform?
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    1. CONo, in Tapestry 5.0 and after, there is a regexp validator - see the [Validation section in the docs](http://tapestry.apache.org/forms-and-validation.html), or in the secord link you provided.
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    2. CO@Henning Those are great news. I just rode a bit that link and updated my answer, so he also has the option of using a catalog for the regxp's. Anyway great link (1+ in comment)
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    3. COi try to provide regexp for passwordfield not for textfield <t:passwordfield t:id="password" t:value="newUser.password" t:validate="required,regexp"/>
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