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From: badri@warren.mentorg.com (Badri Lokanathan)
Subject: Using regular expressions in Micro Emacs 3.10
Message-ID: <BADRI.91May14150327@elysium.warren.mentor.com>
Sender: badri@sdl.scs.com (Badri Lokanathan)
Organization: Mentor Graphics IC group / Warren NJ 07059
Distribution: comp
Date: 14 May 91 15:03:27

I am running Micro Emacs 3.10 alpha on a Mac.
I encountered a couple of problems with the replace command:

(1) Suppose I need to do two global substitutions on a file:
    - Insert XX at the beginning of each line
    - delete YY at the end of each line

I set mode to MAGIC, then execute replace ^ with XX. Now when I try
to replace YY$ with <nothing>, I am unable to get rid of the former
replacement string XX.

Of course, I can always switch the order of execution, but that is not
the answer I am looking for :-)

(2) Is it possible to "remember" a matched pattern and interpolate it
into the replacement pattern (ala vi)? For those who are familiar with
vi, how does one achieve something like

s/\([a-z0-9]*\)_\([a-z0-9]*\)/\2_\1/
-- 
Badri Lokanathan                                  Go ahead, flame away.
badri@sdl.scs.com (or)                            Make my day.
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