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http://issues.apache.org/jira/browse/MYFACES-279?page=comments#action_12313143 
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Bruno Aranda commented on MYFACES-279:
--------------------------------------

Although it can be very helpful for developers when they debug their 
applications ;-) , I think that a 'technical' message can create confusion in 
the standard application user (depending on the targeted users, of course ;-)). 
 It is more helpful to a user to have a comment next to the inputText that says 
something like "Value must follow pattern 00-XXXX" than an error message that 
says "The submitted value ({0}) doesn't fit the pattern \d{2}-\D{4}". You can 
always localize the messages for your situation. As what you need for the 
message to be shown is the pattern as an argument, I see well the change in the 
Validator, but I would keep the current myfaces messages and override them when 
necessary.
Please, could you create the patch using svn diff instead of copying the 
modified files? This will make things easier for the commiters...

Regards,

Bruno

> RegExprValidator Error-Message should show the pattern for better 
> understanding
> -------------------------------------------------------------------------------
>
>          Key: MYFACES-279
>          URL: http://issues.apache.org/jira/browse/MYFACES-279
>      Project: MyFaces
>         Type: Improvement
>     Reporter: Alex Mayer
>     Priority: Minor
>  Attachments: Messages.properties, Messages_de.properties, 
> Messages_en.properties, RegExprValidator.java
>
> To my mind it would be better, if the regExprValidator's ErrorMessage would 
> show a text like this:
> The submitted value ({0}) doesn't fit the pattern "{1}". 
> Because this gives the user and the developer a more detailed information 
> than "the given value ({0}) is not valid". Here the user/ developer has no 
> information what might be the correct input.
> However, I changed the code of RegExprValidator and the german, english and 
> standard message properties so that the pattern is shown in the error-message.

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