A "maxlength" parameter is currently already provided, however I have heaps of use cases where a minimum length would come in handy too, e.g. all sorts of IDs like ISSNs, ISBNs or postal codes, phone numbers etc. I am not sure if a fixed length could be done with just a combination of min and max or if a fixed will be better for this case.
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Have you already experienced a problem where someone entered a value that was too short for one of these fields? Or are you just worried that it could happen in the future?
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Yes, though it is not yet a frequent thing. Currently I use the #len parser function to check the length and provide a warning with other functions after the page was saved. I do this for IBANs.
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Alright. Have you considered, or tried, using the "regex" input type from Semantic Forms Inputs? That would let you validate not just the length but also the format of each field.
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No, will have to dig into this though there are reports that this one is apparently broken. I'll see if that's the case. :)
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I'm declining this - perhaps there's a need for "minlength" and/or "fixedlength" parameters, but the examples provided here (phone number, etc.) seem better handled by the "regexp" input type anyway.