Pattern matching bug

[Grant Robinson <jgrantr@...>]

Consider the following patterns:
"(%w+)=([\"'])([^%2]-)%2"
"([\"'])([^%1]-)%1"

If the first pattern is applied against the following strings:
1) "key1='value1'"
2) "key2='value2'"

It will match #1 and not #2.  Similarly, for the 2nd pattern, if it is
applied against those same two strings, it will match #2, and not #1.

The trouble is in the sequence "([^%2]-)" which should be
"non-greedily match anything except the characters contained in
capture 2".
It appears that is actually doing "non-greedily match anything except
the characters contained in capture 2 and the actual number 2".

Thoughts?  I have already found a workaround, but this pattern is
syntactically valid, it just doesn't work in the expected manner.  I
took a look through lstrlib.c, but it was not immediately obvious
where the problem might be.

-- 
Grant Robinson
jgrantr@gmail.com