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Password validation using struts?

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I have a problem. I am coding for a registeration page using struts and in password field I have to check whether the characters are in 0-9, a-z , A-Z. But the constraint here is the user must have one in each group i.e., one numberic, one lower case and one upper case. The code I have written here is below. I know it is checking either of these group, but how to make this code to fit for the constraint. Please help me , it urgent!!
Thanks in advance.

<field-validator type="regex">
<param name="expression">^[0-9a-zA-Z]*$</param>
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In this case I think you need to overide the validate method in Action and implement checking logic in code.
Posts: 12617
IntelliJ IDE Ruby
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You *could* use a regex for this, but I agree with the original poster--I'd use Java-based validation for this, as it's likely the logic would need to be re-used elsewhere in the application.
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