An extended version of the Unixgrep command.
Egrep accepts extended regular expressions (REs) including
"*" following multi-character REs; "+" (one or more matches);
"?" (zero or one matches); "|" separating two REs matches
either. REs may be bracketed with (). Despite its additional
complexity, egrep is usually faster than fgrep or grep.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
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