extglob negation not working as expected

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I was trying to use negation to exclude directories from globbing, but directories still appear in pattern match: bash-4.3$ ls file_1.txt testdir bash-4.3$ shopt extglob extglob on bash-4.3$ echo !(*/) file_1.txt testdir bash-4.3$ What exactly am I doing wrong ? Note:I know I can use for loop with [ or find command, but I'm trying to figure out extglob specifically.

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