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Regex Match to identify if a field is blank

Is it possible using regex match in conditional logic to identify if a field is blank? I have a radio question with 2 options and (my own) other. When other is selected a conditional text box appears. The submit button appears if either of the two first radio options is selected or the text box has content in it.

So I need to check the text box is not empty. There is no native condition for 'blank field'.

  • 1 comment

Green Tea

 
OK, so it seems REGEX matches is the way forward, this expression works for matching any entry with more than 3 letter characters: (?:[a-zA-Z][- ]?){3}

I could have used the native other and made the text box a required field. But I think it's neater with a custom other and custom submit. I'm going to try and use the form as an overlay survey question in Presto player.