Hi Michael, Michael Glaesemann wrote: > We came across a regexp that takes very much longer than expected. > > PostgreSQL 8.4.1 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.1.2 > 20080704 (Red Hat 4.1.2-44), 64-bit > > SELECT 'ooo...' ~ $r$Z(Q)[^Q]*A.*?(\1)$r$; -- omitted for email brevity
The ? after .* is pointless. If you remove it, the query returns immediately. (There's a badly needed CHECK_FOR_INTERRUPTS in this code BTW) -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
