Hi I am looking to require numbers 0-30 only in a text entry box, in a multiple choice question. I would use a text entry question type, but I need to have two other options available (refused, don't know). I couldn't use custom validation (regex 0-30) because that required something be entered, when the respondent could select one of the other two options. I guess more generally, how can I add radio choices (refused, don't know) to questions of other types (e.g. text entry, matrix, ect.) !

Try using below regex:`\\b([1-9]|[12][0-9]|3[0])\\b`will I use regex code to indicate "if first option is selected, then check the regex"? - No, you need to use option 1 is not selected ORoption 1 text entry matches regex.

Hello @OI899 ,You can use regex, in custom validation you need to check if first option is selected then only check the regex

Number range validation for "allow text entry" text box

Number range validation for "allow text entry" text box | XM Community

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