Slow MySQL query with AS and subquery?

I would move the calculation logic to the client and only load fields from the database. This makes your query and the calculation itself faster. It's not a good style to do such things in SQL code.

And also is the regex very slow, maybe another searching mode like 'LIKE' is faster.

Looking at your EXPLAIN, it doesn't appear your query is utilizing any index (thus the filesort). This is being caused by the sort on the calculated column (score).

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