ChristopherSchultz commented on PR #592:
URL: https://github.com/apache/tomcat/pull/592#issuecomment-1443631640

   I'm curious about performance data when the `\w` has other things added to 
it, which is the case for all examples in Tomcat. This microbenchmark only 
compares `[A-Za-z0-9_]` as the whole character class against `\w` and `[\w]` 
without any other characters added to the character class.
   
   Also, most expressions used in Tomcat have a trailing `+` which in the 
attached performance data show that performance is again terrible. It still 
appears measurably and consistently better than `[A-Za-z0-9_]` but I think it's 
important to benchmark what Tomcat _actually_ uses and not something _very 
close_ to what Tomcat uses.


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