small regexp help

[jianbing.tai at gmail.com]

On Thursday, October 31, 2013 12:56:49 AM UTC+8, rusi wrote:
> Well it seems that we are considerably closer to a solution to the GG double-spaced crap problem.
> 
> 
> 
> Just wondering if someone can suggest a cleanup of the regexp part
> 
> 
> 
> Currently I have (elisp)
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> 
> 
> (defun clean-gg () 
> 
>   (interactive)
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> 1  (replace-regexp "^> *\n> *\n> *$" "-=\=-" nil 0 (point-max))
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> 2  (flush-lines "> *$" 0 (point-max))
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> 3  (replace-regexp "-=\=-" "" nil 0 (point-max)))
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> 
> 
> Which I spell out as:
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> 
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> 1. Replace triplets of empty lines of the form
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> 
> 
> >
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> >
> 
> >
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> with only 1 (because this is an actual blank line and not a GG-crap line)
> 
> However then it gets mixed up with the others so put some strange string:
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> "-=\=-" as replacement
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> 
> 
> 2. Remove the pure
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> > 
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> lines
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> 
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> 3. Remove the strange string.
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> 
> 
> Not very robust since the strange string could occur in the text.
> 
> So what are the more proper regexp solution(s)?

Why not replace the triple "> " with blank directly?
maybe looks like: (replace-regexp "^> *\n> *\n> *$" "" nil 0 (point-max)
(Not fully sure whether your replace-regex could work with such format.)

PS: this is python group, assume your question better post on Lisp or Regular Expression related groups.