bug#41262: Weird behavior with grep regex

[loic.tregouet]

Hi,

I've reproduced a strange behaviour of grep command when a file name of a 
single letter is present in current directory .

$ echo a | grep [a-z]
a
$ touch t
$ echo a | grep [a-z]
$ rm t
$ echo a | grep [a-z]
a
$


Any idea ?

Regards

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