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run code in 150+ php & hhvm versions
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<?php $num = ' 527545855 '; var_dump( preg_match( '/\d+/', substr( $num, 0, 18 ), $coincidencias ) ); var_dump($coincidencias);exit;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(1) { [0]=> string(9) "527545855" }