[ID
19991110.002] minimal matching discrepancy found by pcre author
seems to have been fixed (though differently from what was suggested
in the report) in 5.6.0. Add tests to keep the bug from reappearing.
p4raw-id: //depot/perl@6408
^([^,]*,){2}c a,b,c y $1 b,
(?i) y - -
'(?!\A)x'm a\nxb\n y - -
+^(a(b)?)+$ aba y -$1-$2- -a--
+^(aa(bb)?)+$ aabbaa y -$1-$2- -aa--