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From: Sean McAfee <eefacm@gmail.com>
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Subject: Re: Another replace regexp with list question
Date: Tue, 11 Jun 2013 11:23:44 -0700
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Leandro Marcolino <leandromarcolino@gmail.com> writes:
> This time I am trying to find occurrences of:
>
> "<span style='color:white'>&#31169;&#31169;&#31169;&#31169;</span>", but
> the number of &#31169; can change from 1 to many.
>
> And I want to replace each &#31169; of the list to a white space (besides
> removing the <span> clause). So, if there were x "&#31169;", I need x " ".

Replace: \(<span style='color:white'>\)\(\(?:&#31169;\)+\)\(</span>\)
With:    \1\,(make-string (/ (length \2) 8) ? )\3