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This is particularly useful if you are using complex validation patterns.
It makes analyzing, reporting and then acting on your data easier when it all conforms to certain formatting.
A Regular Expression pattern or Reg Ex pattern is a sequence of characters that is used to validate specific string formats in user input.
These patterns are commonly used to ensure the data collected is properly formatted.
Click Edit on the follow-up question that you want to show to respondents who answered that they have Gmail accounts, then click Logic.
In the Logic tab, you should see a link to Add logic to control when this question is displayed.