andygrove commented on code in PR #3656:
URL: https://github.com/apache/datafusion-comet/pull/3656#discussion_r2965940777


##########
native/spark-expr/src/conversion_funcs/string.rs:
##########
@@ -1095,31 +1108,31 @@ fn timestamp_parser<T: TimeZone>(
     // Define regex patterns and corresponding parsing functions
     let patterns = &[
         (
-            Regex::new(r"^\d{4,5}$").unwrap(),
+            Regex::new(r"^\d{4,7}$").unwrap(),

Review Comment:
   I already commented on this on the other PR, but are these regexes compiled 
on each invocation or are these static? I wasn't sure.



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