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<?php $strings = [ '8x10 frame', '8*10 frame', '8 * 10 frame', '8 x 10 frame', '8x10 photo frame' ]; var_export(preg_replace('~\d\K ?[x*] ?(?=\d)~i', ' x ', $strings));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '8 x 10 frame', 1 => '8 x 10 frame', 2 => '8 x 10 frame', 3 => '8 x 10 frame', 4 => '8 x 10 photo frame', )

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