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<?php $value = 0.12; $regexp = '/^(-)?[0-9]+(\.[0-9][0-9]?)?$/'; preg_match($regexp, $value, $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(3) { [0]=> string(4) "0.12" [1]=> string(0) "" [2]=> string(3) ".12" }