Suggest a command line syntax

From	Victor Porton <porton@narod.ru>
Newsgroups	comp.programming
Subject	Suggest a command line syntax
Date	2014-12-22 20:10 +0200
Organization	Aioe.org NNTP Server
Message-ID	<m79mpq$p0h$1@speranza.aioe.org> (permalink)

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I am writing a program (in fact a Perl script), which should do replacement 
of strings in a file, like this:

AB->BC
BC->AB
YY->ZZ

Note that Sed and relatives fail to do this task: It would replace BC back 
with AB after replacing AB with BC, and this is not what I need.

What command line syntax to specify strings to be replaced and replacement 
strings for my command?

I need an advice about the syntax of command line.

-- 
Victor Porton - http://portonvictor.org

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Suggest a command line syntax Victor Porton <porton@narod.ru> - 2014-12-22 20:10 +0200
  Re: Suggest a command line syntax Richard Heathfield <invalid@see.sig.invalid> - 2014-12-22 18:42 +0000
    Re: Suggest a command line syntax Victor Porton <porton@narod.ru> - 2014-12-22 20:48 +0200
      Re: Suggest a command line syntax Richard Heathfield <invalid@see.sig.invalid> - 2014-12-22 19:44 +0000
  Re: Suggest a command line syntax Kaz Kylheku <kaz@kylheku.com> - 2014-12-22 20:09 +0000
  Re: Suggest a command line syntax Robert Wessel <robertwessel2@yahoo.com> - 2014-12-22 14:46 -0600
    Re: Suggest a command line syntax Kaz Kylheku <kaz@kylheku.com> - 2014-12-22 21:40 +0000

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