<?php
 
// your code goes here
$regexp = '/^(\d+)(\.\d+){0,2}(\.\d)?(\-.*)?/';
 
$version_strs = array("4.0", "4.1-dev", "4.1.0", "4.1.0-beta1", "4.1.0-beta2",
	"4.1.0-rc1", "4.1.0-rc2", "4.1.0-rc3", "4.1.0deb0ubuntu1ppa1", "4.1.1", "4.1.10",
	"4.1.10-dev", "4.1.11", "4.1.11deb0.1", "4.1.11deb1", "4.1.11deb2", "4.1.12", 
	"4.1.12deb0.1", "4.1.12deb2", "4.1.13", "4.1.14", "4.1.14.1", "4.1.14.2", "4.1.14.3", 
	"4.1.14.4", "4.1.14.5", "4.1.14.6", "4.1.14.7", "4.1.14.8", "4.1.14deb0.1", "4.1.14deb0.2", 
	"4.1.14deb1", "4.1.2", "4.1.2deb0ubuntu1ppa1", "4.1.3", "4.1.3deb0ubuntu1ppa1", "4.1.4", 
	"4.1.4deb0ubuntu1ppa1", "4.1.5", "4.1.5deb0ubuntu1ppa1", "4.1.6", "4.1.6deb0ubuntu1ppa1", 
	"4.1.7", "4.1.7-dev", "4.1.7deb0ubuntu1ppa1", "4.1.8", "4.1.8deb1", 
	"4.1.8deb1~ubuntu12.04.1~ppa1", "4.1.9", "4.1.9-dev", "4.1.9deb0.1", "4.1.9deb1", 
	"4.2.0", "4.2.0-alpha1", "4.2.0-alpha2", "4.2.0-beta1", "4.2.0-dev", "4.2.0-rc1", 
	"4.2.1", "4.2.10", "4.2.10.1", "4.2.10.1deb1", "4.2.11", "4.2.11deb0.1", "4.2.12", 
	"4.2.12deb1", "4.2.12deb2", "4.2.12deb2+deb8u1", "4.2.12deb2+deb8u1build0.15.04.1", 
	"4.2.12deb2+deb8u2", "4.2.13", "4.2.13.1", "4.2.13.1deb1~ppa1~trusty1", "4.2.13.2", 
	"4.2.13.3", "4.2.1deb1", "4.2.1deb1.1", "4.2.2", "4.2.2-dev", "4.2.2deb0.1", 
	"4.2.2deb0rnx1", "4.2.2deb2", "4.2.2deb2.precise~ppa.1", "4.2.2deb2.quantal~ppa.1", 
	"4.2.2deb2.trusty~ppa.1", "4.2.3", "4.2.3deb0.1", "4.2.3deb1", "4.2.3deb1.precise~ppa.1", 
	"4.2.3deb1.saucy~ppa.1", "4.2.3deb1.trusty~ppa.1", "4.2.3deb1.utopic~ppa.1", "4.2.4", 
	"4.2.5", "4.2.5deb0.1", "4.2.5deb1", "4.2.6"
);
 
$ret_array = array();
foreach ($version_strs as $version) {
	if (preg_match_all($regexp, $version, $ret_array)) {
		echo $ret_array[0][0] . "\n";
	}
}

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