Without going ahead and creating the expression for you - I suggest creating an expression rule that checks the text value on length, structure (certain character types at certain indexes) using text functions, and returns a boolean output always.
Without going ahead and creating the expression for you - I suggest creating an expression rule that checks the text value on length, structure (certain character types at certain indexes) using text functions, and returns a boolean output always.
You can use regex pattern matching in any place you'd use other expression logic. In this case, Stefan is referring to using it in the text field's "validations" parameter.