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<?php $string = ' Test1,One line Test2,"Two lines Hello" Test3,One line '; echo preg_replace_callback('~"[^"]*"~', function($m) { return preg_replace('~\R+~', '', $m[0]); }, $string);
Output for git.master, git.master_jit, rfc.property-hooks
Test1,One line Test2,"Two lines Hello" Test3,One line

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