I need to split the keyword on search input and generate an sql query,
for ex:   the input value is:   europe+america,asia
so I want to generate an sql like this:
SELECT * FROM mytable WHERE message LIKE %europe% AND message LIKE %america%
OR message LIKE %asia%

The + (plus) means AND and , (comma) means OR. Also I need to control input
variables to prevent error on sql query forexample an input value like:
,,,europe+america,+asia+    should not generate an error.

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