F5 Data Guard - Expose last 4 digits for Custom Pattern

Hello,

I believe that this use case can be done with irules.

You will need to identify a pattern, search for this pattern in your response page, and then replace the the response with only last for digits.

This irule ma

when HTTP_RESPONSE {
    set response_data [HTTP::response]

    # Regex to match the email pattern
    set pattern {([a-zA-Z0-9._%+-]+)@([a-zA-Z0-9.-]+\.[a-zA-Z]{2,})}
    
    # Replace the matched email with asterisks and keep the last four characters of the email
    regsub -all $pattern $response_data {****@\$2} masked_response
    
    # Replace the original response with the masked one
    HTTP::response replace 0 [HTTP::header Content-Length] $masked_response
}

regards