comphead commented on code in PR #13919:
URL: https://github.com/apache/datafusion/pull/13919#discussion_r1902025654


##########
docs/source/user-guide/sql/scalar_functions.md:
##########
@@ -1758,167 +1758,6 @@ encode(expression, format)
 
 - [decode](#decode)
 
-## Regular Expression Functions
-
-Apache DataFusion uses a 
[PCRE-like](https://en.wikibooks.org/wiki/Regular_Expressions/Perl-Compatible_Regular_Expressions)
-regular expression [syntax](https://docs.rs/regex/latest/regex/#syntax)
-(minus support for several features including look-around and backreferences).
-The following regular expression functions are supported:
-
-- [regexp_count](#regexp_count)
-- [regexp_like](#regexp_like)
-- [regexp_match](#regexp_match)
-- [regexp_replace](#regexp_replace)
-

Review Comment:
   The reason being the document printer checks first the `doc section` if its 
doesn't match with predefined enum the printer skips such function. The reason 
why it skips we need add a description to `doc_section` to be as
   ```
       doc_section(
           label = "Regular Expression Functions",
           description = r#"Apache DataFusion uses a 
[PCRE-like](https://en.wikibooks.org/wiki/Regular_Expressions/Perl-Compatible_Regular_Expressions)
   regular expression [syntax](https://docs.rs/regex/latest/regex/#syntax)
   (minus support for several features including look-around and 
backreferences).
   The following regular expression functions are supported:"#,
       ),
   ```
   
   The description doesn't match as in attribute the `description` is not set



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