One feature I've used quite often, which I found through the linked pcre.txt file, is the \K option, which resets the match start. I think this should definitely be in the help file because it is extremely useful (it is similar to a lookbehind assertion, except much more flexible). I know that the quick reference is only meant, well, for quick references. But all I'm suggesting is an entry in that nice "Commonly Used Symbols and Syntax" table. Nothing big.
Here are the details about it from the
PCRE file:
Quote:
Resetting the match start
The escape sequence \K, which is a Perl 5.10 feature, causes any previ-
ously matched characters not to be included in the final matched
sequence. For example, the pattern:
foo\Kbar
matches "foobar", but reports that it has matched "bar". This feature
is similar to a lookbehind assertion (described below). However, in
this case, the part of the subject before the real match does not have
to be of fixed length, as lookbehind assertions do. The use of \K does
not interfere with the setting of captured substrings. For example,
when the pattern
(foo)\Kbar
matches "foobar", the first substring is still set to "foo".
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