Could someone provide the right regex string to input into the custom validation box to do this. The respondent should be forced to enter 10 digits, not less and not more

!Sorry, it doesn't seem to be working. I've pasted the screenshot - is this how it needs to be inputted in custom validation?

I want to add a custom validation to ensure 10 digits are entered in a entry box

I want to add a custom validation to ensure 10 digits are entered in a entry box | Experience Community