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Ohhh, you're doing a search engine. In that case, regex isn't exactly what you're looking for, and it's a little more complex than that. You have to index the keywords / tags / phrases within the database, then upon a user searching, split up the phrase as needed, and search the database for any (partially) matching results. Then write a relevancy algorithm, etc.
You're best off either just using an existing free PHP search engine out there, or having a developer take care of this for you.
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