Denis Fondras <open...@ledeuns.net> writes: > Hello all,
Hi, > This afternoon I stumbled upon a weirdness I can't explain. I hope some > misc-guru can give a clue. > > I was parsing a 45kB html document on my OpenBSD 5.3 with the help of > sed to extract a value and it was awfully slow. Quoting the input string > gave it a real boost : > > $ time echo "$webpage" | sed -n -r > 's/(.*)\"token\":\"([a-zA-Z0-9]+)\"(.*)/\2/p' > 0m0.19s real 0m0.00s user 0m0.00s system > > $ time echo $webpage | sed -n -r > 's/(.*)\"token\":\"([a-zA-Z0-9]+)\"(.*)/\2/p'> > 2m14.39s real 2m12.95s user 0m0.00s system > > > What could be the explanation ? Without the quotes the shell performs splitting, maybe ksh(1) is a bit slow at this... I'd rather download the page to a temp file rather than put that stuff into memory. > Doing the same with GNU sed is instantaneous in both case (quoted/unquoted). Just by replacing sed by gsed, on the same system? > Thank you in advance, > Denis -- jca | PGP: 0x06A11494 / 61DB D9A0 00A4 67CF 2A90 8961 6191 8FBF 06A1 1494
