NEWBIE: ishexdigit revisited

Kirk Strauser kirk at strauser.com
Tue Dec 30 23:05:05 CET 2003


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At 2003-12-30T21:45:13Z, Paul Rubin <http://phr.cx@NOSPAM.invalid> writes:

> You're using an extreme example and seeing the cost of the cache lookup in
> the first example.

The OP may be coding in an extreme situation.  Given the free performance
gain without requiring any more work, resources, or syntax, I can't think of
a good reason *not* to pre-compile any regexp used more than a few times.

> You're certainly not seeing the pattern get recompiled a million times in
> 5 seconds.  Doing would be many times slower.

Regardless of the cause, there's still a 400% increase in overhead in my
example by not pre-compiling the pattern.
- -- 
Kirk Strauser
The Strauser Group
Open. Solutions. Simple.
http://www.strausergroup.com/
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