if (strpos($str, '1 minute') !== false)
{

}

$string = "Lorem ipsum 51 Minutes on StackOverflow";
$regex = "/b1 Minuteb";

$match = preg_match( $string, $regex );

if(strpos($haystack, $needle) !== false) {
    // do something here
}

$string = '51 Minutes';
$needle = '1 Minute';

preg_match(
    '/^' . $needle . '$/',
    $string,
    $matches
);

if ($matches[0])
{

}