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I am refering one open source code. There I can found an sql with this kind of a filter.
select sometext from table1,table2 where table1.sometext LIKE
CONCAT('% ',table2.test_keyword,' %') AND table2.test_keyword NOT
REGEXP '__*';
What is that __* in this sql?
__*matches one_followed by zero or more_s._+would have done the same job.