alamb commented on PR #8631:
URL: 
https://github.com/apache/arrow-datafusion/pull/8631#issuecomment-1868272762

   > Hmm, captures_at is actually to extract all groups matched (i.e., 
searching matched strings). For compiling the regex, it should happen in 
Regex::new (this is where we catch compilation error) which is relatively 
faster (0.3%).
   
   Ah, that makes sense (that captures_at is the actual matching). Maybe 
pre-compiling won't get us as much afterall


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