How to insert special characters in ID number

i have a text question type for client identification number which i used regex code to allow for alphanumerict entry as well as number of characters but unable to use special characters like hyphen (-) as a saparator between alphabets and numbers.
Example of ID Number looks like GHA-123456789-8 and the regex code is regex(.,‘[A-Za-z0-9]{13}’)

You can mask the special regex meaning of a character with a \, e.g. \- or \.

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@vibrantfield, you should be able to do it as outlined in our support article Restricting Text Responses With Regular Expressions.

You should be able to find other discussions on regex here.