* lisp/comint.el (comint-password-prompt-regexp): Make it less vague.
Bump custom version. The initial regexp-opt was bracketed by \\( \\)?, so it might as well have not been there at all. This change makes it non-optional, and adds back "^". Hopefully the behaviour is now closer to that of emacs-23, before it was re-written in http://debbugs.gnu.org/2817.
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