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<?php $tests = [ '00.12', '0.12', '00', '0', '0012.12', '00023', ]; foreach ($tests as $test) { echo $test . (preg_match('~^(?:[1-9]\d*|0{1,2})(?:\.\d{2})?$~', $test) ? ' pass' : ' fail') . "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
00.12 pass 0.12 pass 00 pass 0 pass 0012.12 fail 00023 fail

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