Validate user replies with regex in a bot flow

When you ask a user a question in a bot flow, they might type anything. Regex (regular expression) validation lets you specify the exact format a reply must match — a 10-digit phone number, a 6-digit OTP, a 2-digit age, or an email address — and reject any reply that does not match before continuing the flow.

Add regex validation to a question

In your bot flow, open or add an Ask a Question block.

Set the question type to Text (not buttons or interactive).

Scroll to the Validation section of the block.

Enable validation and select Regex as the validation type.

Enter your regex pattern in the pattern field.

Enter a validation error message — this is sent to the user when their reply does not match (e.g., 'Please enter a valid 10-digit mobile number').

Set how many times the bot should retry before giving up or routing elsewhere.

Save the block.

Common regex patterns

Copy any of these into the validation field:

10-digit Indian mobile number:  /^[6-9]\d{9}$/
6-digit OTP:                    /^\d{6}$/
2-digit number:                 /^\d{2}$/
Email address:                  /^[\w.-]+@[\w.-]+\.[a-z]{2,}$/
Date (DD/MM/YYYY):              /^\d{2}\/\d{2}\/\d{4}$/
Pincode (India, 6 digits):      /^[1-9][0-9]{5}$/

Generate regex with AI

Not sure how to write a pattern? Use the Regex Creator GPT — describe what you need in plain English and it generates the pattern for you.

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Validate user replies with regex in a bot flow

Add regex validation to a question

Common regex patterns

The Ask a Question block

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