[Docs] Add like, regexp function documents (#6182)

* [Docs] Add like, regexp function documents

* Reconstruct

* Fix compile error

docs/en/sql-reference/sql-functions/string-functions/append_trailing_char_if_absent.md

@@ -32,8 +32,8 @@ under the License.
 
 `VARCHAR append_trailing_char_if_absent(VARCHAR str, VARCHAR trailing_char)`
 
-If the s string is non-empty and does not contain the c character at the end, it appends the c character to the end.
-Trailing_char contains only one character, and it will return NULL if contains more than one character
+If the @str string is non-empty and does not contain the @trailing_char character at the end, it appends the @trailing_char character to the end.
+@trailing_char contains only one character, and it will return NULL if contains more than one character
 
 ## example
 

docs/en/sql-reference/sql-functions/string-functions/like/like.md

@@ -0,0 +1,67 @@
+---
+{
+    "title": "like",
+    "language": "en"
+}
+---
+
+<!-- 
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# like
+## description
+### syntax
+
+'BOOLEAN like(VARCHAR str, VARCHAR pattern)'
+
+Perform fuzzy matching on the string str, return true if it matches, and false if it doesn't match.
+
+like match/fuzzy match, will be used in combination with % and _.
+
+'a'   // Precise matching, the same effect as `=`.
+'%a'  // data ending with a
+'a%'  // data starting with a
+'%a%' // data containing a
+'_a_' // Three digits and the middle letter is a
+'_a'  // Two digits and the ending letter is a
+'a_'  // Two digits and the initial letter is a
+
+## example
+
+```
+// Return the data containing a in the k1 string
+mysql> select k1 from test where k1 like '%a%';
++-------+
+| k1    |
++-------+
+| a     |
+| bab   |
++-------+
+
+// Return the data equal to a in the k1 string
+mysql> select k1 from test where k1 like 'a';
++-------+
+| k1    |
++-------+
+| a     |
++-------+
+```
+
+## keyword
+LIKE

docs/en/sql-reference/sql-functions/string-functions/like/not_like.md

@@ -0,0 +1,68 @@
+---
+{
+    "title": "not like",
+    "language": "en"
+}
+---
+
+<!-- 
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# not like
+## description
+### syntax
+
+'BOOLEAN not like(VARCHAR str, VARCHAR pattern)'
+
+Perform fuzzy matching on the string str, return false if it matches, and return true if it doesn't match.
+
+like match/fuzzy match, will be used in combination with % and _.
+
+'a'   // Precise matching, the same effect as `=`.
+'%a'  // data ending with a
+'a%'  // data starting with a
+'%a%' // data containing a
+'_a_' // Three digits and the middle letter is a
+'_a'  // Two digits and the ending letter is a
+'a_'  // Two digits and the initial letter is a
+
+## example
+
+```
+// Return data that does not contain a in the k1 string
+mysql> select k1 from test where k1 not like '%a%';
++-------+
+| k1    |
++-------+
+| b     |
+| bb    |
++-------+
+
+// Return the data that is not equal to a in the k1 string
+mysql> select k1 from test where k1 not like 'a';
++-------+
+| k1    |
++-------+
+| bab   |
+| b     |
++-------+
+```
+
+## keyword
+LIKE, NOT, NOT LIKE

docs/en/sql-reference/sql-functions/string-functions/regexp/not_regexp.md

@@ -0,0 +1,56 @@
+---
+{
+    "title": "not regexp",
+    "language": "en"
+}
+---
+
+<!-- 
+licensed to the apache software foundation (asf) under one
+or more contributor license agreements.  see the notice file
+distributed with this work for additional information
+regarding copyright ownership.  the asf licenses this file
+to you under the apache license, version 2.0 (the
+"license"); you may not use this file except in compliance
+with the license.  you may obtain a copy of the license at
+
+  http://www.apache.org/licenses/license-2.0
+
+unless required by applicable law or agreed to in writing,
+software distributed under the license is distributed on an
+"as is" basis, without warranties or conditions of any
+kind, either express or implied.  see the license for the
+specific language governing permissions and limitations
+under the license.
+-->
+
+# not regexp
+## description
+### syntax
+
+'BOOLEAN not regexp(VARCHAR str, VARCHAR pattern)'
+
+Perform regular matching on the string str, return false if it matches, and return true if it doesn't match. pattern is a regular expression.
+
+## example
+
+```
+// Find all data in the k1 field that does not start with 'billie'
+mysql> select k1 from test where k1 not regexp '^billie';
++--------------------+
+| k1                 |
++--------------------+
+| Emmy eillish       |
++--------------------+
+
+// Find all the data in the k1 field that does not end with 'ok':
+mysql> select k1 from test where k1 not regexp 'ok$';
++------------+
+| k1         |
++------------+
+| It's true  |
++------------+
+```
+
+## keyword
+REGEXP, NOT, NOT REGEXP

docs/en/sql-reference/sql-functions/string-functions/regexp/regexp.md

@@ -0,0 +1,56 @@
+---
+{
+    "title": "regexp",
+    "language": "en"
+}
+---
+
+<!-- 
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# regexp
+## description
+### syntax
+
+'BOOLEAN regexp(VARCHAR str, VARCHAR pattern)'
+
+Perform regular matching on the string str, return true if it matches, and return false if it doesn't match. pattern is a regular expression.
+
+## example
+
+```
+// Find all data starting with 'billie' in the k1 field
+mysql> select k1 from test where k1 regexp '^billie';
++--------------------+
+| k1                 |
++--------------------+
+| billie eillish     |
++--------------------+
+
+// Find all data ending with 'ok' in the k1 field:
+mysql> select k1 from test where k1 regexp 'ok$';
++----------+
+| k1       |
++----------+
+| It's ok  |
++----------+
+```
+
+## keyword
+REGEXP