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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
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Subject: Shell Mode keywords
Date: Tue, 14 Jul 2015 11:22:00 +0200
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Shell Mode defines these keywords:

(defvar shell-font-lock-keywords
   '(("[ \t]\\([+-][^ \t\n]+\\)" 1 font-lock-comment-face)
     ("^[^ \t\n]+:.*" . font-lock-string-face)
     ("^\\[[1-9][0-9]*\\]" . font-lock-string-face))
   "Additional expressions to highlight in Shell mode.")

I infer that the first regexp is meant to match command options.
What is the purpose of the other two regexps?

Thank you.