Henning_Thornblad wrote:
> What can be the cause of the large difference between re.search and
> grep?
grep uses a smarter algorithm ;)
> This script takes about 5 min to run on my computer:
> #!/usr/bin/env python
> import re
>
> row=""
> for a in range(156000):
> row+="a"
> print re.search('[^ "=]*/',row)
>
>
> While doing a simple grep:
> grep '[^ "=]*/' input (input contains 156.000 a in
> one row)
> doesn't even take a second.
>
> Is this a bug in python?
You could call this a performance bug, but it's not common enough in real
code to get the necessary brain cycles from the core developers.
So you can either write a patch yourself or use a workaround.
re.search('[^ "=]*/', row) if "/" in row else None
might be good enough.
Peter
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