On May 26, Patrick R. Michaud said:
<commit> N backtracking fails completely
<cut> N remove what matched up to this point from the
<after P> N we must be after the pattern P
<!after P> N we must NOT be after the pattern P
<before P> N we must be before the pattern P
<!before P> N we must NOT be before the pattern P
As with ':words', etc., I'm not sure that these qualify as "tokens"
when parsing the regex -- the tokens are actually "<" or "<!" and
I'm curious if <commit> and <cut> "capture" anything. They don't start
with '?', so following the guidelines, it would appear they capture, but
that doesn't make sense. Should they be written as <?commit> and <?cut>,
or is the fact that they capture silently ignored because they're not
Same thing with <null> and <prior>. And with <after P> and <before P>.
It should be assumed that <!after P> doesn't capture because it can only
capture if P matches, in which case <!after P> fails.
So, what's the deal?
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