Question

Hi I have a regular expression which allows only letters and some characters (.-) and whitespace. The problem is that I want it to pass even when the textfield is empty. The \s requires a space, which is fine, but I want it to pass without any keyboard input as well. Here it is:

^[\sA-Za-z.-]+$

Answer 1

Change + quantifier to *, and you are done: –

^[\sA-Za-z.-]*$

It will match 0 or more occurrences. And 0 occurrence will mean empty string.