Hello - I used SP2016 on premises. I would like to validate Multiple lines of Text Box (Comments field) not allow special characters. How can I validate it with Nintex Form Validation Rule? I’m appreciated for your help.
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Validate Multiple lines of Text Box not allow special characters

Best answer by SimonMuntz
Hi
Great question.
Unfortunately, the validation features do not allow for a regular expression, so you will have to use a long rule that checks if the text in the control has a special character.
The below checks for two special characters, but you must keep adding || or statements to this rule for each character you want to check.
contains(MLT,"?")||contains(MLT,"@")
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