Thank you very much.
Could you give me a rough idea of what the MySQL query would look like?
I am trying to work out the syntax using string functions like LOCATE,
INSTR, SUBSTRING and SUBSTRING_INDEX.
That's not going to be fast even with indexes :( Not sure what you can
do about it though. You either need to do it in the database or php, so
one of them will be a memory / cpu hog :/
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