Fix regex match failures for backrefs combined with non-greedy quantifiers.
An ancient logic error in cfindloop() could cause the regex engine to fail to find matches that begin later than the start of the string. This function is only used when the regex pattern contains a back reference, and so far as we can tell the error is only reachable if the pattern is non-greedy (i.e. its first quantifier uses the ? modifier). Furthermore, the actual match must begin after some potential match that satisfies the DFA but then fails the back-reference's match test. Reported and fixed by Jeevan Chalke, with cosmetic adjustments by me. Branch ------ REL9_0_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/1a8a3f64cedeb943062b9b2ae3412e9d66545ef1 Modified Files -------------- src/backend/regex/regexec.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
