PHP Regex to match word in a sentence with optionally only other certain words -


i'm looking php regex match word in sentence optionally permit other words in sentence match should fail if there other words in sentence not in allowed list. eg:

the quick fox

here i'm looking fox. 'the' , 'quick' ok if appear. since words optional 

fox

would ok too. however, 

the quick brown fox

is not ok. don't want brown fox.

feel free suggest way of doing needs blazing fast.

edit: words come before fox can appear in order 

 quick fox

should match too.

just make first 2 words optional.

^(?:(?:the )?(?:quick )?fox|(?:quick )(?:the )?fox|(?:fox )?(the )?quick|(?:the )?(?:fox )?quick)$

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