in reply to Re^5: Regular expression to check for invalid file name characters
in thread Regular expression to check for invalid file name characters

I understand. And I think it is a good thing to check if the filenames are supplied by (especially novice) users.

If they enter a filename "temp\fred.txt", you could end creating fred.txt in the temp subdirectory rather than their expectation on a file called temp\fred.txt in \.

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