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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: grep -E instead of egrep?
Date: Mon, 16 Oct 2006 14:47:11 -0400
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Xref: news.gmane.org gmane.emacs.devel:60798
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    So you're probably right about egrep being much more portable, because
    it's been created before grep -E, but in the future, egrep is meant to
    disappear.

-E was specified by POSIX, more than a decade ago.
By now, we can assume it is supported.