[yaroslawww]

You can use regex /(?:.+\/)(.+\.(png|jpg|jepg))[?#]?.*$/

Example:

$examples = [
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/with_query.jpg?itok=b8HiA95H',
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/with_hash.jpg#hghgh',
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/with_query.jpg?',
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/with_hash.jpg#',
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/with_multydots.65560759.jpg',
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/image.png',
    'http://images.fitnessmagazine.mdpcdn.com/sites/story/without_ext',   
    ];

foreach($examples as $example) {
    preg_match('/(?:.+\/)(.+\.(png|jpg|jepg))[?#]?.*$/', $example, $matches);
    
    if(isset($matches[1]) && $matches[1]) {
     echo "Url: {$example}, image name: {$matches[1]} \n";   
    } else {
        echo "Url: {$example} is not image url \n";   
    }
}

Printed:

Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/with_query.jpg?itok=b8HiA95H, image name: with_query.jpg 
Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/with_hash.jpg#hghgh, image name: with_hash.jpg 
Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/with_query.jpg?, image name: with_query.jpg 
Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/with_hash.jpg#, image name: with_hash.jpg 
Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/with_multydots.65560759.jpg, image name: with_multydots.65560759.jpg 
Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/image.png, image name: image.png 
Url: http://images.fitnessmagazine.mdpcdn.com/sites/story/without_ext is not image url 

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