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Struts2 Regex Validation killing me, Please help

 
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Hi Friends,

I am trying to use regex for normal string validation. Tried various regular expression but struts2 validation didn't work for me. In below example I am trying to validate string which will have only Capital letters A to Z. Can anyone help me to find correct regular expression for validating string with special characters.

<field name="regexValidatorField">
<field-validator type="regex">
<param name="expression"><![CDATA[[A-Z]]]></param>
<message><![CDATA[ regexValidatorField must have all capilate A- Z characters ]]></message>
</field-validator>
</field>
 
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IntelliJ IDE Ruby
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That regex is only for a single character.
 
Don't get me started about those stupid light bulbs.
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