open expects a file name/path, not a wildcard or regular expression (think of it this way: What should it do in case more than one file would match? Open several files to one handle?).

Use glob to expand a wildcard expression (the single unknown digit would be [0-9]), and then open one of the matching file names.

In reply to Re: Wildcards - open a file with one unknown digital character by almut
in thread Wildcards - open a file with one unknown digital character by mypatek

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