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Date: Sat, 2 May 2015 10:20:25 +0100
From: Mike Clarke <jmc-freebsd2@milibyte.co.uk>
To: Alex Merritt <merritt.alex@gmail.com>
Cc: Nancy Belle <belle@antennex.com>, freebsd-questions
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Subject: Re: Find and replace content in 100 lines
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On Fri, 1 May 2015 18:18:12 -0400
Alex Merritt <merritt.alex@gmail.com> wrote:

> Hm, yes, the picket fence. How about
> 
> sed -i .orig -r
> 's:"((\.\./){3})arch1/arch14":"\1\1foo/foo2/foo3/arch1/arch14":g' input.html
> 
> Group it and repeat as \1

Yes, much neater, except that you will need sed -E otherwise you'd need
to escape all the grouping parentheses.

And to make it even more compact, how about

curlew:/tmp% cat input.html

aa"../../../arch1/arch14"bb
ccc"../../d1/arch1/arch14"ddd
ee"../../../arch1/arch14"ff

curlew:/tmp% sed -E 's:(([.]{2}/){3}):\1\1foo/foo2/foo3/:' input.html

aa"../../../../../../foo/foo2/foo3/arch1/arch14"bb
ccc"../../d1/arch1/arch14"ddd
ee"../../../../../../foo/foo2/foo3/arch1/arch14"ff

-- 
Mike Clarke