egghelp/eggheads community

string match vs regexp, which is faster?

2004-11-15T14:17:06-04:00

your repetition count of 1 screws the results, but yes, generally [string match] is always faster than [regexp] since the code it translates to is much more simple and optimized

more accurate results:

Code:

[demond@whitepine demond]$ tclsh8.4% set a blahblah% time {regexp -nocase $a skldjfsdfblah290387423890} 10007 microseconds per iteration% time {string match -nocase *${a}* skldjfsdfblah290387423890} 10002 microseconds per iteration

Statistics: Posted by demond — Mon Nov 15, 2004 2:17 pm

string match vs regexp, which is faster?

2004-11-15T13:27:15-04:00

does this sound right to you?

[11:28] < Isa >. stringmatching is 25 microseconds per iteration : Notice
[11:28] < Isa >. regexping is 21721 microseconds per iteration : Notice

i thought regexp would be much faster

Code:

set e "entry"bind pubm -|- * test_speedproc test_speed {nick uhost handle chan text} {  global e  set stringmatch [time {string match -nocase "*$e*" "$text"} 1]  set regexping [time {regexp -nocase {$e} $text} 1]  putquick "NOTICE $nick :stringmatching is $stringmatch"  putquick "NOTICE $nick :regexping is $regexping"}

Statistics: Posted by Dedan — Mon Nov 15, 2004 1:27 pm

Re: string match vs regexp, which is faster?

2004-11-15T12:48:38-04:00

I have no way of testing the speed of these commands.

yes you have

it's called time

Statistics: Posted by demond — Mon Nov 15, 2004 12:48 pm

string match vs regexp, which is faster?

2004-11-15T12:38:48-04:00

I have no way of testing the speed of these commands.
does anyone have the time and means to test this for me?

Code:

set e "entry"proc test_speed {text} {  global e  if {[string match -nocase "*$e*" "$text"]} {  if {[regexp -nocase {$e} $text]} {}

thanks for any help given

Statistics: Posted by Dedan — Mon Nov 15, 2004 12:38 pm