php - negative pattern matching to exclude certain files using glob -


i using glob images directory. however, of images in directory thumbnails identified "-m" before file extension , want exclude these file list. so, example there be:

image-1.png image-1-m.png  portrait.png  portrait-m.png  front-panel-cold.png front-panel-cold-m.png  front-panel-warm.png  front-panel-warm-m.png

using 

foreach(glob($imdir."/*[!m].*") $img) {     echo $img . "<br>\n"; }

i can list files don't end m, excludes front-panel-warm.png. can't find way of escaping hyphen: 

glob($imdir."/*[!\-m].*")

gives no results, 

glob($imdir."/*[!-m].*")

gives same results [!m] , 

glob($imdir."/*[!--m].*")

excludes files ending letter before n. i've tried using brace 

glob($imdir."/*[!{-m}].*", glob_brace)

but doesn't seem work either.

any ideas going wrong, or need use preg_match for?

use exclude files ending -m

foreach(glob($imdir."/*[!-]?[!m]?.png") $img) {     echo $img . "<br>\n"; }

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