Constraints for total characters that can be entered

I am unsure of the constraint syntax that needs to be used to enter a string of characters within a particular size. I've used the syntax given below:
|text|reas_diss|What are the reasons of your dissatisfaction?|Specify in 100 characters|(string_size(${reas_diss})<=100|

Please help/suggest an improvement.

You can use this constraint: regex(.,'^\S{2,2}.{0,100}$')

It allow at least two and maximum 100 character. You can modify the regex.

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regex will work and you can learn more about those at

And you can also use string-length(). More about that at

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Thank you. This helped a lot.

Thank you. I used string_length(). But this may be useful at other times.

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