[GitHub] [arrow-datafusion] alamb commented on issue #7185: Support simplifying expressions such as `~ ^(ba_r|foo)$` , where the string includes underline

["alamb (via GitHub)" <gi...@apache.org>]

alamb commented on issue #7185:
URL: https://github.com/apache/arrow-datafusion/issues/7185#issuecomment-1663931856

   `_` has special meaning in SQL regex syntax, specifically matching any single character. Thus I am not sure the rewrite you propose is correct
   
   ```
   postgres=# select 'foo' LIKE 'fo_';
    ?column?
   ----------
    t
   (1 row)
   ```
   
   ```
   str = ~  ^(id_1|id_2)$
   ```
   
   Could be rewritten to this though:
   
   ```
   str = ~  ^(id_2)$ OR str = ~  ^(id_2)$
   ```
   
   


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