Pattern item `\@>', :h /\@>
IMHO, `\@>' is almost useless. Example: try to only match an odd number
of backslashes before what follows in the text.
Pattern (b = backslash-pattern, w = what-follows-pattern):
\%(b\%(bb\)*\)\@>w
This pattern does not work as intended -- it still matches within an
even number of backslashes, as it retries with shorter matches (shorter
match starts after the first `b' in the text below). Eg
... bbbbw
... ^^^^ <- possible unintended match
What's needed: when `\%(...\)\@>' succeeds, a retry (in case the whole
pattern fails) must start *after the end* of its match (not one
character to the right), just like as if it was a successfully processed
match (eg in a substitute command).
Notes
* `\@>' could be interesting to avoid the slow `\@<!' item
* Why does the example in the help `\%(a*\)\@>a' work?
Because each retry (of `\%(a*\)\@>') with shorter match fails too.
--
Andy
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