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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
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Subject: Re: How should a clone of the `grep` program highlight matches for
	Emacs?
Date: Mon, 29 Jun 2015 17:58:33 +0200
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On 21/06/15 16:32, Raffaele Ricciardi wrote:
>      (princ "\x1b[31m") ; 31 means "red", as hard-coded in `grep.el`
>      (princ (match-string-no-properties 0))
>      (princ "\x1b[0m"))

This works:

     (princ "\x1b[01;31m")
     (princ (match-string-no-properties 0))
     (princ "\x1b[m")