sub is_valid_name {$_[0] !~ m{[\\/:*?"<>|]}}

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Note however that this allows an empty name (which isn't valid in most filesystems). Also note that it's filesystem dependent what are valid and invalid character. For instance, most UNIX filesystems allow any character, except "\x{00}" and "/", the former being a C string terminator convention, the latter being the path separator.

In reply to Re: Regular expression to check for invalid file name characters by JavaFan
in thread Regular expression to check for invalid file name characters by merrymonk

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