fix: fix typo and update function docs

datafusion/functions/src/encoding/inner.rs

@@ -131,10 +131,10 @@ impl ScalarUDFImpl for EncodeFunc {
 #[user_doc(
     doc_section(label = "Binary String Functions"),
     description = "Decode binary data from textual representation in string.",
-    syntax_example = "decode(e xpression, format)",
+    syntax_example = "decode(expression, format)",
     argument(
         name = "expression",
-        description = "Expression containing string or binary data"
+        description = "Expression containing encoded string data"
     ),
     argument(name = "format", description = "Same arguments as [encode](#encode)"),
     related_udf(name = "encode")

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)
-
-### `regexp_count`
-
-Returns the number of matches that a [regular expression](https://docs.rs/regex/latest/regex/#syntax) has in a string.
-
-```
-regexp_count(str, regexp[, start, flags])
-```
-
-#### Arguments
-
-- **str**: String expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **regexp**: Regular expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **start**: - **start**: Optional start position (the first position is 1) to search for the regular expression. Can be a constant, column, or function.
-- **flags**: Optional regular expression flags that control the behavior of the regular expression. The following flags are supported:
-  - **i**: case-insensitive: letters match both upper and lower case
-  - **m**: multi-line mode: ^ and $ match begin/end of line
-  - **s**: allow . to match \n
-  - **R**: enables CRLF mode: when multi-line mode is enabled, \r\n is used
-  - **U**: swap the meaning of x* and x*?
-
-#### Example
-
-```sql
-> select regexp_count('abcAbAbc', 'abc', 2, 'i');
-+---------------------------------------------------------------+
-| regexp_count(Utf8("abcAbAbc"),Utf8("abc"),Int64(2),Utf8("i")) |
-+---------------------------------------------------------------+
-| 1                                                             |
-+---------------------------------------------------------------+
-```
-
-### `regexp_like`
-
-Returns true if a [regular expression](https://docs.rs/regex/latest/regex/#syntax) has at least one match in a string, false otherwise.
-
-```
-regexp_like(str, regexp[, flags])
-```
-
-#### Arguments
-
-- **str**: String expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **regexp**: Regular expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **flags**: Optional regular expression flags that control the behavior of the regular expression. The following flags are supported:
-  - **i**: case-insensitive: letters match both upper and lower case
-  - **m**: multi-line mode: ^ and $ match begin/end of line
-  - **s**: allow . to match \n
-  - **R**: enables CRLF mode: when multi-line mode is enabled, \r\n is used
-  - **U**: swap the meaning of x* and x*?
-
-#### Example
-
-```sql
-select regexp_like('Köln', '[a-zA-Z]ö[a-zA-Z]{2}');
-+--------------------------------------------------------+
-| regexp_like(Utf8("Köln"),Utf8("[a-zA-Z]ö[a-zA-Z]{2}")) |
-+--------------------------------------------------------+
-| true                                                   |
-+--------------------------------------------------------+
-SELECT regexp_like('aBc', '(b|d)', 'i');
-+--------------------------------------------------+
-| regexp_like(Utf8("aBc"),Utf8("(b|d)"),Utf8("i")) |
-+--------------------------------------------------+
-| true                                             |
-+--------------------------------------------------+
-```
-
-Additional examples can be found [here](https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/regexp.rs)
-
-### `regexp_match`
-
-Returns the first [regular expression](https://docs.rs/regex/latest/regex/#syntax) matches in a string.
-
-```
-regexp_match(str, regexp[, flags])
-```
-
-#### Arguments
-
-- **str**: String expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **regexp**: Regular expression to match against.
-  Can be a constant, column, or function.
-- **flags**: Optional regular expression flags that control the behavior of the regular expression. The following flags are supported:
-  - **i**: case-insensitive: letters match both upper and lower case
-  - **m**: multi-line mode: ^ and $ match begin/end of line
-  - **s**: allow . to match \n
-  - **R**: enables CRLF mode: when multi-line mode is enabled, \r\n is used
-  - **U**: swap the meaning of x* and x*?
-
-#### Example
-
-```sql
-            > select regexp_match('Köln', '[a-zA-Z]ö[a-zA-Z]{2}');
-            +---------------------------------------------------------+
-            | regexp_match(Utf8("Köln"),Utf8("[a-zA-Z]ö[a-zA-Z]{2}")) |
-            +---------------------------------------------------------+
-            | [Köln]                                                  |
-            +---------------------------------------------------------+
-            SELECT regexp_match('aBc', '(b|d)', 'i');
-            +---------------------------------------------------+
-            | regexp_match(Utf8("aBc"),Utf8("(b|d)"),Utf8("i")) |
-            +---------------------------------------------------+
-            | [B]                                               |
-            +---------------------------------------------------+
-```
-
-Additional examples can be found [here](https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/regexp.rs)
-
-### `regexp_replace`
-
-Replaces substrings in a string that match a [regular expression](https://docs.rs/regex/latest/regex/#syntax).
-
-```
-regexp_replace(str, regexp, replacement[, flags])
-```
-
-#### Arguments
-
-- **str**: String expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **regexp**: Regular expression to match against.
-  Can be a constant, column, or function.
-- **replacement**: Replacement string expression to operate on. Can be a constant, column, or function, and any combination of operators.
-- **flags**: Optional regular expression flags that control the behavior of the regular expression. The following flags are supported:
-- **g**: (global) Search globally and don't return after the first match
-- **i**: case-insensitive: letters match both upper and lower case
-- **m**: multi-line mode: ^ and $ match begin/end of line
-- **s**: allow . to match \n
-- **R**: enables CRLF mode: when multi-line mode is enabled, \r\n is used
-- **U**: swap the meaning of x* and x*?
-
-#### Example
-
-```sql
-> select regexp_replace('foobarbaz', 'b(..)', 'X\\1Y', 'g');
-+------------------------------------------------------------------------+
-| regexp_replace(Utf8("foobarbaz"),Utf8("b(..)"),Utf8("X\1Y"),Utf8("g")) |
-+------------------------------------------------------------------------+
-| fooXarYXazY                                                            |
-+------------------------------------------------------------------------+
-SELECT regexp_replace('aBc', '(b|d)', 'Ab\\1a', 'i');
-+-------------------------------------------------------------------+
-| regexp_replace(Utf8("aBc"),Utf8("(b|d)"),Utf8("Ab\1a"),Utf8("i")) |
-+-------------------------------------------------------------------+
-| aAbBac                                                            |
-+-------------------------------------------------------------------+
-```
-
-Additional examples can be found [here](https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/regexp.rs)
-
 ## Time and Date Functions
 
 - [current_date](#current_date)