After reading this article, you will understand how to configure Enhanced Validation to ensure end users capture data exactly as you intended using Regular Expression (RegEx).
Before you get started
These articles might be helpful before you read further:
Enhanced Validation - Regular Expression (Regex)
Regex extends in-form data validation for text type questions. It allows for powerful validations to be written ensuring that users are entering accurate information into text fields.
Using Regular Expressions in Youreka
On any text type question, enter the desired Regular Expression into the Match Regex Pattern field. Include an optional Error Message in Error Message for Regex Validation. Save your question and the validation will begin checking user's entries when the form template is published.
Reading on Advanced Regular Expressions
The example given above is comparably simple when considering what can be achieved using regex. For more details, advanced tools and use cases check out these links below: