) refers to ‘this question’, while the regular expression inside the quotation marks ( ' ') needs to conform to the established regex rules. In the Validation Code box, enter your regex formula between the quotation marks (' ') of the regex(., ' ') format. Go to Validation Criteria and choose the Manually enter your validation logic in XLSForm code option. To use a regex in KoBoToolbox, follow these steps ¶ ![]() controlling the entry of mobile number to exactly 10 digits, controlling the entry of a valid email id etc.). KoBoToolbox supports regex to control the length and characters during data entry to a particular question (e.g. ![]() It is widely used to validate, search, extract, and restrict text in most programming languages. ![]() Restricting Text Responses With Regular Expressions ¶Ī regular expression, or regex, is a search pattern used for matching specific characters and ranges of characters within a string.
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