I have a question entitled "Last Name" -- I want to make the field Mandatory, and use a regular expression to restrict the input to only letters, dashes, and apostrophe (letters must allow for foreign characters as well -- like French accented characters, etc).

I checked here: www.limesurvey.org/manual/Using_regular_expressions , but there are no examples for this scenario.

Can anyone provide a regex that will prevent a question from being submitted if it doesn't meet the above?

Maybe best question is : what is disallowed ?

For example to allow only non white-space you can use /^(\S)*$/ .

But to disallow specific c&aracter : /^([^\s|!|?|\.]|)*$/

Thanks Denis, generally I would agree, but we have to limit our input to only French or English characters.

We've tried both:
/^[a-zA-ZÀÂÉÊÈËÌÏÎÔÙÛÇÆŒàâéêèëìïîôùûçæœ '-]{3,100}$/
and
/^[^@!#$%^&?*+=_0-9~`:;\"<>[\]{}\/\\]{3,100}$/

Both of which work on regex101.com but don't work in the validation field in LS3

Any help that can be provided is greatly appreciated.

Ah, yes … just checked …
Your expression is OK in PHP but not in JS, because js encode htmlentities when get value.

Can you try with
regexMatch("/^[a-zA-ZÀÂÉÊÈËÌÏÎÔÙÛÇÆŒàâéêèëìïîôùûçæœ '-]{3,100}$/",html_entity_decode(self.NAOK))

PS : it can be great to report the issue :
LemVal must encode only when view, but not when used in another function (for example strlen(self.NAOK) with é return 8 …

Thank you for your continued support.

I copied the expression into the validation field and tried again, but it still doesn't appear to work.

This is what I have in my validation field:



I've also attached my question.

DenisChenu wrote: Can you try with
regexMatch("/^[a-zA-ZÀÂÉÊÈËÌÏÎÔÙÛÇÆŒàâéêèëìïîôùûçæœ '-]{3,100}$/",html_entity_decode(self.NAOK))
:

Is Regexmatch available in ExpressionScript / ExpressionManager?

Not still planned?
www.limesurvey.org/manual/Expression_Man..._or_Being_Considered

Not in validation, in Question validation equation

See sample (with strlen to show the issue)

@jelo : no, included since … 1.98 i think ?

@DenisChenu Oh wow! Fantastic, that totally works. Thank you so much for helping out!

DenisChenu wrote: @jelo : no, included since … 1.98 i think ?

Thanks, the English manual already list the function as implemented. The GERMAN manual page is outdated. Sorry.

The GERMAN manual page is outdated. Sorry.

Why would you read anything else than the English manual, if you know English?

First of all, the manual is always behind the actual software. Then imagine a manual page that has to be translated from the original manual page...