Finally I ended using (it's also working for different languages of Recaptcha challenges) if someone searches for the same:
">CSS>iframe[src^=' https://www.google.com/recaptcha/api2/bframe ']>FRAME> >CSS>#recaptcha-verify-button"
Hey, I got the result in BAS variable but the result was an array but when it is passed to BAS variable it converts to string. I want to use that BAS variable as an array so i can loop through it, how can i achieve that please ?
The result of executing the action will always be a string, use a delimiter, then the string to parse into an array