according to mysql regex we can use
select * from onet.tools_and_technology where t2_example Rlike '[[:space:]]*C++[[:space:]]*';
Error Code: 1139. Got error 'repetition-operator operand invalid' from
+ character is similar to the
* character in a regex: they're meta characters.
You need to escape each character with
\. Because you are working in a string, you will need to escape the escape:
Your problem can be solved without regexes, though:
LIKE '% c++ %'
This is much more readable.