diff --git a/python/datafusion/functions/__init__.py b/python/datafusion/functions/__init__.py
index 291957490..bfa71379f 100644
--- a/python/datafusion/functions/__init__.py
+++ b/python/datafusion/functions/__init__.py
@@ -1761,6 +1761,11 @@ def regexp_like(
     Tests a string using a regular expression returning true if at least one match,
     false otherwise.
 
+    Args:
+        string: Data to test against the regular expression.
+        regex: Regular expression to search for.
+        flags: Flags to control regex behavior.
+
     Examples:
         >>> ctx = dfn.SessionContext()
         >>> df = ctx.from_pydict({"a": ["hello123"]})
@@ -1797,6 +1802,11 @@ def regexp_match(
     Returns an array with each element containing the leftmost-first match of the
     corresponding index in ``regex`` to string in ``string``.
 
+    Args:
+        string: Data to match against the regular expression.
+        regex: Regular expression to search for.
+        flags: Flags to control regex behavior.
+
     Examples:
         >>> ctx = dfn.SessionContext()
         >>> df = ctx.from_pydict({"a": ["hello 42 world"]})
@@ -1839,6 +1849,13 @@ def regexp_replace(
     Supported flags with the addition of 'g' can be found at
     <https://docs.rs/regex/latest/regex/#grouping-and-flags>
 
+    Args:
+        string: Data to search for the regular expression match.
+        pattern: Regular expression to search for.
+        replacement: Text substituted for each match.
+        flags: Flags to control regex behavior. Add ``g`` to replace every
+            match rather than only the first.
+
     Examples:
         >>> ctx = dfn.SessionContext()
         >>> df = ctx.from_pydict({"a": ["hello 42"]})
@@ -1885,6 +1902,12 @@ def regexp_count(
     Optional start position (the first position is 1) to search for the regular
     expression.
 
+    Args:
+        string: Data to search for the regular expression match.
+        pattern: Regular expression to search for.
+        start: Position to start the search (the first position is 1).
+        flags: Flags to control regex behavior.
+
     Examples:
         >>> ctx = dfn.SessionContext()
         >>> df = ctx.from_pydict({"a": ["abcabc"]})
@@ -1929,10 +1952,10 @@ def regexp_instr(
     Args:
         values: Data to search for the regular expression match.
         regex: Regular expression to search for.
-        start: Optional position to start the search (the first position is 1).
-        n: Optional occurrence of the match to find (the first occurrence is 1).
-        flags: Optional regular expression flags to control regex behavior.
-        sub_expr: Optionally capture group position instead of the entire match.
+        start: Position to start the search (the first position is 1).
+        n: Occurrence of the match to find (the first occurrence is 1).
+        flags: Flags to control regex behavior.
+        sub_expr: Capture group position instead of the entire match.
 
     Examples:
         >>> ctx = dfn.SessionContext()