Check if filename is valid.

Qingyang さんによって質問されました 2012 年 7 月 20 日

最新アクティビティ Thomas さんによって回答されました 2017 年 12 月 1 日

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Hi, is there a native function or a simple code to check if a user-typed filename is valid for saving a file? (In that it doesn't contain illegal characters like /\":?<>|, etc.)

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Answer by Sean de Wolski on 20 Jul 2012

Accepted Answer

regexp it!

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Qingyang on 20 Jul 2012

So it would be like this?

if regexp(fname, '[/\*:?"<>|]', 'once')
  do something about it?
end

Jan on 23 Jul 2012

Let UIPUTFILE check the file name instead of using an edit control.

Jason Nicholson on 14 Feb 2014

This code snippet will not work unless you check if it is empty.

if ~isempty(regexp(filename, '[/\*:?"<>|]', 'once'))
        %Do something
end

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Answer by Daniel Shub on 23 Jul 2012

A long time ago, probably Windows 95 on a FAT16 harddisk, I started using the following:

regexp(fname, ['^(?!^(PRN|AUX|CLOCK\$|NUL|CON|COM\d|LPT\d|\..*)', ...
  '(\..+)?$)[^\x00-\x1f\\?*:\"><|/]+$'], 'once'));

At that time, Windows had the most restrictive file name conventions. I am not sure what the rules are now. You also should check for the length of the path and the total number of characters in the file name.

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Jan on 23 Jul 2012

Windows 7: Either 260 characters, or start with //?/ and 32767 characters, while each folder can have up to 255 characters. The later works for most of the API-functions, but not e.g. for the Windows Explorer. Moving a file name with a long name to the RecycleBin fails also. The backup program and server based tools might fail also. Therefore I'd prefer the dull limit of 260 characters (including "C\:" and a trailing terminator '\0')!).

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Answer by ola bayo on 16 Oct 2017

Edited by Walter Roberson on 16 Oct 2017

Which following is a valid file name in MATLAB?

A) lab 2
B) lab2
C) lab-2
D) 2lab
E) LAB 2

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Walter Roberson on 16 Oct 2017

For the question as phrased: all of them. For a slightly different question, the answer would be fairly different.

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Answer by Thomas on 1 Dec 2017

If you do not want to use UIputfile, another option is fopen. fileID = fopen(filename,'w') if fopen cannot open the file, then fileID is -1.

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