PHP Regex prefix with image file extension -

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i want display files prefix: 7ws9xfd1rhvaupxh37nb_ must have file extension of .jpg, .png, .gif

these sample strings:

7ws9xfd1rhvaupxh37nb_magnifying_glass_icon.png 7ws9xfd1rhvaupxh37nb_url.gif 54a8sx555a4rrgsabwzq_korea.jpg 7ws9xfd1rhvaupxh37nb_6780969-cool-abstract-wallpaper.png 7ws9xfd1rhvaupxh37nb_wall_1409747331_multicolor-geometric-shapes.jpg

i've used regex no luck: 

$key  "7ws9xfd1rhvaupxh37nb"; $regex = '~^'.$key.'-.*\.((jpg)|(png)|(gif))$~'; $files = $files = preg_grep($regex, scandir("../temp/"));

there difference between - , _. check regex , modify slightly: 

$regex = '~^'.$key.'_.*\.((jpg)|(png)|(gif))$~';

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