A RegEx, or Regular Expression, is a sequence of characters that forms a text pattern. RegEx can be used to check if a string contains the specified search pattern.
For example, if you want to collect US phone numbers and want to ensure that the respondents enter valid US phone numbers, you can apply a RegEx pattern to the question. By doing so, all the respondents will have to enter the telephone numbers matching to the US telephone number format - (xxx) xxx-xxxx. If the phone number fails to match that pattern, an error message will display indicating that it must match the appropriate format.
RegEx pattern validation can be added to text input type questions.
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