with which function I can count text field?

for example, 09125353730 give me back [11]?

with which function I can count text field?

for example, 09125353730 give me back [11]?

I suggest you rephrase what you exactly are trying to achieve. My answers are doing exactly what they are supposed to do, but somehow you are expected something different and I can't figure out from your replies what that is.

You mention you have a value in the field, but what you mention is a calculation. Is this is calculated value? Where is it applied?

By the way, the calc you are using always returns 11 digits as long as the user typed 8 or more. You go from using Left(), through Middle() to Right(). Think about what will happen in this calc.

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Length() evaluates spaces too. Actually every char is counted. So what you are looking for is Length(Filter(number mobile; "0123456789")) = 11 as validation formula for your number. Instead of triggering a script just do it via validation of the field and a dialog will pop up when the validation doesn't validate.

Length()