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<?php $lines = [ "need 4 speed", "4 speed", "speed 4", "4speed", "speed4", "speed2car", "need 4speed", "need4 speed", ]; var_export( preg_replace("~(?<= |^)\d+ | \d+(?= |$)~", '', $lines) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'need speed', 1 => 'speed', 2 => 'speed', 3 => '4speed', 4 => 'speed4', 5 => 'speed2car', 6 => 'need 4speed', 7 => 'need4 speed', )

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