| Description: |
Per the manual, backrefs are not allowed inside lookahead constraints, and all parentheses therein are considered non-capturing. But the regexp parser forgets these restrictions when it recurses to enter a parenthesized subexpression inside a LACON. So we get silliness like this (tested with 8.6.4):
% regexp -inline {x(\w)(?=(\1))} {xyz}
xy y
% regexp -inline {x(?=((foo)))} {xfoobar}
x {}
Fix is a one-liner, see attached patch, which is a Tcl-ified version of
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=a43b4ab1111ca5e5f40a2ddd8e56bf999b9fdad9
|
