comint-use-prompt-regexp

comint-use-prompt-regexp is a variable defined in `comint.el'.
Its value is

nil

Documentation:
If non-nil, use `comint-prompt-regexp' to recognize prompts.
If nil, then program output and user-input are given different `field'
properties, which Emacs commands can use to distinguish them (in
particular, common movement commands such as `beginning-of-line'
respect field boundaries in a natural way).

You can customize this variable.