sql: add a link about regular expression compatibilit with MySQL (#17475

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pingcap · May 14, 2024 · 84730ca · 84730ca
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diff --git a/functions-and-operators/string-functions.md b/functions-and-operators/string-functions.md
@@ -2323,7 +2323,7 @@ Output:
 
 ## Regular expression compatibility with MySQL
 
-The following sections describe the regular expression compatibility with MySQL.
+The following sections describe the regular expression compatibility with MySQL, including `REGEXP_INSTR()`, `REGEXP_LIKE()`, `REGEXP_REPLACE()`, and `REGEXP_SUBSTR()`.
 
 ### Syntax compatibility
 

diff --git a/mysql-compatibility.md b/mysql-compatibility.md
@@ -277,6 +277,10 @@ The following column types are supported by MySQL but **not** by TiDB:
 
 - `SQL_TSI_*` (includes SQL_TSI_MONTH, SQL_TSI_WEEK, SQL_TSI_DAY, SQL_TSI_HOUR, SQL_TSI_MINUTE, and SQL_TSI_SECOND, but excludes SQL_TSI_YEAR)
 
+### Regular expressions
+
+For information about TiDB regular expression compatibility with MySQL, including `REGEXP_INSTR()`, `REGEXP_LIKE()`, `REGEXP_REPLACE()`, and `REGEXP_SUBSTR()`, see [Regular expression compatibility with MySQL](/functions-and-operators/string-functions.md#regular-expression-compatibility-with-mysql).
+
 ### Incompatibility due to deprecated features
 
 TiDB does not implement specific features deprecated in MySQL, including: