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<?php $strings = [ 'Subject', // expect empty string '1234 Subject', // expect 1234 'Subject 5678', // expect 5678 '1234 Subject 5678', // expect 1234 'Test 1234 Subject 5678 test', // expect 1234 ]; var_export( preg_replace('/^\D+|\d+\K.*/', '', $strings) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '', 1 => '1234', 2 => '5678', 3 => '1234', 4 => '1234', )

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