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_2_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/f1cb440d3eaab839bfa5c8f2db529b5c87025058 Modified Files -------------- src/backend/regex/regexec.c | 20 +++++++++++--------- src/test/regress/expected/regex.out | 15 +++++++++++++++ src/test/regress/sql/regex.sql | 5 +++++ 3 files changed, 31 insertions(+), 9 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
