rluvaton commented on code in PR #14282:
URL: https://github.com/apache/datafusion/pull/14282#discussion_r1932901931
##########
docs/source/user-guide/sql/scalar_functions.md:
##########
@@ -1919,6 +1920,31 @@ SELECT regexp_replace('aBc', '(b|d)', 'Ab\\1a', 'i');
Additional examples can be found
[here](https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/regexp.rs)
+### `regexp_extract`
+
+Extract a specific group matched by [regular
expression](https://docs.rs/regex/latest/regex/#syntax). If the regex did not
match, or the specified group did not match, an empty string is returned..
+
+```
+regexp_extract(str, regexp[, idx])
Review Comment:
this seems like the index is optional while it is required
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