Add MySQl strip_tags() function

Documentation/Manual.rst

@@ -6860,6 +6860,21 @@ Output::
 
   hello world-
 
+.. _strip_tags:
+
+strip_tags: strip html tags
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The SQL function strip_tags(input) returns 'input' without any HTML tags.
+
+Example::
+
+   10.sql = SELECT strip_tags('<a href="https://example.com"><b>my name</b> <i>is john</i></a> - end of sentence')
+
+Output::
+
+  my name is john - end of sentence
+
 .. _download:
 
 Download

extension/Classes/Sql/function.sql

@@ -83,3 +83,23 @@ BEGIN
   SET output = IF(input = '', token, input);
   RETURN output;
 END;
+
+###
+#
+# strip_tags(input) - copied from https://stackoverflow.com/questions/2627940/remove-html-tags-from-record
+#
+DROP FUNCTION IF EXISTS strip_tags;
+CREATE FUNCTION `strip_tags`(str TEXT)
+  RETURNS TEXT
+  DETERMINISTIC
+  SQL SECURITY INVOKER
+BEGIN
+  DECLARE start, end INT DEFAULT 1;
+  LOOP
+    SET start = LOCATE("<", str, start);
+    IF (!start) THEN RETURN str; END IF;
+    SET end = LOCATE(">", str, start);
+    IF (!end) THEN SET end = start; END IF;
+    SET str = INSERT(str, start, end - start + 1, "");
+  END LOOP;
+END;
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