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Shell Mode keywords


From: Raffaele Ricciardi
Subject: Shell Mode keywords
Date: Tue, 14 Jul 2015 11:22:00 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1

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.


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