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Slick hang in perl RE search
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Topic: Slick hang in perl RE search (Read 2315 times)
jporkkahtc
Senior Community Member
Posts: 2620
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Slick hang in perl RE search
«
on:
August 29, 2017, 11:58:29 PM »
In the regex tool I was playing with a regex to match a path.
Open the attached TXT file.
In Find, do a Perl RE search in that file with this pattern
([a-zA-Z]
?([\\/]*[^\r\n<>:"\\/|?*]+)+[\\/]?\(([0-9]+)\):
And slick hangs.
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Clark
SlickEdit Team Member
Senior Community Member
Posts: 6866
Hero Points: 528
Re: Slick hang in perl RE search
«
Reply #1 on:
August 31, 2017, 02:39:52 PM »
Reproduced. Thanks for the small sample
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Clark
SlickEdit Team Member
Senior Community Member
Posts: 6866
Hero Points: 528
Re: Slick hang in perl RE search
«
Reply #2 on:
August 31, 2017, 03:16:12 PM »
It turns out that this is a really slow regex. If you let it run for a very long time, it will finish. On my machine (pretty fast windows machine), it takes about 62 seconds to finish.
If I hold down Ctrl+Alt+Shift+F2, the search is cancelled.
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jporkkahtc
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Posts: 2620
Hero Points: 210
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Re: Slick hang in perl RE search
«
Reply #3 on:
August 31, 2017, 04:35:33 PM »
Thanks.
Can you give any advice on why it is so slow and how to improve it?
I tried a number of things, but it seemed that as I made changes it would go from being quick to being *really* slow - not a lot of in between.
I tried replacing "+" with "+?" and "++". Especially with ++ I expected it to make a perf difference.
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Clark
SlickEdit Team Member
Senior Community Member
Posts: 6866
Hero Points: 528
Re: Slick hang in perl RE search
«
Reply #4 on:
August 31, 2017, 10:13:39 PM »
Without spending too much time on it I tried this:
([a-zA-Z]
?+([\\/]*+[^\r\n<>:"\\/|?*]++)+:
I got rid of most of the backtracking. I'm not sure what you were trying to accomplish with the regex stuff after what I used.
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Slick hang in perl RE search