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<?php $source_string = ('Lorem ipsum dolor sit amet, [amzn 0970810458 "The Title of This Book"] consectetur adipiscing elit. Mauris facilisis felis eu turpis ultrices molestie. Donec vel ornare eros. Integer pharetra hendrerit tincidunt. Nunc in magna vitae nibh tempus pulvinar. Cras lacinia nibh ac justo placerat pretium. Mauris volutpat non ligula sit amet tempus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. [amzn 097081044X "Another Book Title"] Suspendisse tincidunt tristique ante.'); $result = preg_replace('/\[amzn ([^\s]+) "(.+?)"\]/', '<a href="https://www.amazon.com/dp/$1">$2</a>', $source_string); echo $result;
Output for git.master, git.master_jit, rfc.property-hooks
Lorem ipsum dolor sit amet, <a href="https://www.amazon.com/dp/0970810458">The Title of This Book</a> consectetur adipiscing elit. Mauris facilisis felis eu turpis ultrices molestie. Donec vel ornare eros. Integer pharetra hendrerit tincidunt. Nunc in magna vitae nibh tempus pulvinar. Cras lacinia nibh ac justo placerat pretium. Mauris volutpat non ligula sit amet tempus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. <a href="https://www.amazon.com/dp/097081044X">Another Book Title</a> Suspendisse tincidunt tristique ante.

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