$re = '/(start.*)?(start.*end)/m';
$str = 'Situated start about 150 start miles start(240 km) north of Las Vegas, the remote start hamlet of just 50 year-round start residents lacks a grocery store end or even a gasoline station. Situated start about 150 start miles start(240 km) north of Las Vegas, the remote start hamlet of just 50 year-round start residents lacks a grocery store end or even a gasoline station. Situated start about 150 start miles start(240 km) north of Las Vegas, the remote start hamlet of just 50 year-round start residents lacks a grocery store end or even a gasoline station. Situated start about 150 start miles start(240 km) north of Las Vegas, the remote start hamlet of just 50 year-round start residents lacks a grocery store end or even a gasoline station.';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php