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bug#26193: [0-9] versus [[:digit:]]

From: Paul Eggert
Subject: bug#26193: [0-9] versus [[:digit:]]
Date: Wed, 22 Mar 2017 11:01:43 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 03/22/2017 05:44 AM, John P. Linderman wrote:
That puts the runtimes on equal footing:

In my measurements, P[0-9] is still a tiny bit slower if one is using glibc regex, due to a performance problem in glibc. You can work around it by configuring --with-included-regex. It's probably not worth worrying about, though.

By the way, using LC_ALL=C should help avoid performance problems like these in the future, if all you're doing is something where single-byte pattern matching suffices.

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