On 10/11/12 10:38, tjg wrote:
> Just for my information, and if you have the time, could you
> detail for me the forensics of this not-so-"ugly brute" ?
:%s/\([#@&]\=\<\w\+\>\).\{-}\zs \+[#@&]\@<!\1\>//g
\(...\) capture something of interest which is
[#@&] one of these characters
\= optionally
\< a word-starts-here boundary
\w\+ one or more Word characters
\> the word must end here
.\{-} as little as possible to meet the following
\zs consider the pattern-match starting here
(effects what gets replaced)
<space>\+ one-or-more mandatory spaces before the dupe
[#@&]\@<! assert that we can't mismatch[1] before here
\1 the thing we captured must match here
\> the match must end here too[2]
So it's roughly looking for something of interest followed by stuff,
followed by some spaces, followed by the thing-of-interest again
(and no more). It then replaces the spaces-plus-duplicate-match
with nothing.
Hope that helps make sense of it.
-tim
[1]
this is what prevents it from getting snagged on things like
my text has a &text or @text or #text
from matching
[2]
this prevents partial matches like
this text is textual
where "text" and "textual" might be considered a match
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