Thank you Denzel for replying for the IS_EXPR(), In fact I did my own validator that does what I need It's nice though to know about "onvalidation" which makes life easier
For the other translation problem, I guess after all that error messages where ever they're should be made easy to translate , this makes sense and make it easier to use web2py so if some validators can't have their error messages be translated, this makes me create my own validators every time I can't have them translated and the new validators will be just a copy/paste code from the original validators except for the custom error message, and this's not good . web2py has a policy to make error messages be easily to translate and you can't just omit that for some validators because after a whie you'll end up with too many validators like that , this will enforce users to re-create their own validators , and this is not what web2py is a bout any way . So I my self vote for a change to make those validators error_messages can be translated easily Thank you
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