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Beginners Php Question - Preg_Match


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I am a total beginner at php, and have found a need for preg_match. Even after looking through posts here, this example is still rather beyond me. Can someone point me in the right direction.


I have a string $params with the content as below.


"metadata.title": "",

"metadata.description": "",

"metadata.keywords": "",

"metadata.robots": "",

"metadata.author": "",

"config.enable_comments": "0",

"config.primary_category": "311"


How can I extract the value between the "" after the primary_category, in this case 311.




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