We couldn't create the file/folder the exceed the length. ============================ MACINTOSH OS 9 CONVENTIONS, The only illegal character for file and folder names in Mac OS 9 is the colon ":", File and folder names may be up to 31 characters in length, ============================ MACINTOSH OS X CONVENTIONS. but it deosn't seem to work with < and > characters. For interoperability, all this may be useful. 1 They are special in the command line shell ( cmd.exe ), but it surely could (and in fact does) handle escaping like Unix shells do. example: as the first character of a name. Avoid using spaces and underscores; use a hyphen instead. Microsoft's documentation neglects to mention COM0 and LPT0 which explorer.exe has trouble with (even on Windows 10 20H2), possibly because of a bug. The two systems have much in common, but the characters permitted in a file or folder name may differ. Most operating systems are case sensitive; always use lowercase. The limit applies to the combination of the folder path and file name after decoding. For more information about file streams, see File Streams. Don’t start or end your filename with a space, period, hyphen, or underline. what is the escape character? The solution is to rename the file via the conflicthandler on the Windows PC or rename the file on the device that uploaded the file. The Windows operating system can use two different file systems, Protected-Mode File Allocation Table (FAT) file system and the New Technology File System (NTFS). *]/','','my file is * invalid ?.pdf'); Note: The previous conventions are true only if the application used in managing them is does not use the Unicode API. *]/' (gross). Hello, I know this is an old thread, but I need to know what expression to put in order to remove all illegal characters from a word. Mac OS restrictions: Box does not support opening spaces. For example, spaces and dots are valid filename characters, but names composed only of those characters are forbidden. How to Delete or Rename a Folder with an Invalid File Name in Windows 7, Vista, XP, etc. But on Unix (and thus Android) alone, the only invalid characters are NULL (0x00) and /. https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file. (It looks like C# uses the @ prefix to denote verbatim strings, which look like Python's raw strings, and should only need a single escape for the regex engine. But as far as I know, it does have the scenario, some files may produced by the application and program or other operating system that exceed the path, could still be in the windows system. Although, the underlying file system may support such names, the Windows shell and, user interface does not. Keep your filenames to a reasonable length and be sure they are under 31 characters. Task [ top ] Identify forbidden characters, and understand why you cannot use them. Fforbidden filename characters is not going to work on Windows because it reserves filenames as well as characters. In the conventions listed below, it is true for both systems unless otherwise specified. So I think you'll need a total of four \ characters: '/[<>:"/\\\\|? However some windows applications like Explorer, for example, may not behave correctly in this circumstance. The Filename data type is a text string containing a file name or folder. The control characters 0x00-0x1f and 0x7f are also invalid on Windows. I can't sync them properly with my PC because I keep getting errors about invalid filenames. The new docs URL is now https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file. The dot (period or full-stop) as a filename extension separator, as well as the limit to three-letter extensions, appeared in the 1970s. javascript: and others are forbidden, but there are a infinite number of names composed only of valid characters that are forbidden. - Characters whose integer representations are in the range from 1 through, 31, except for alternate data streams where these characters are. The following characters are invalid as file or folder names on Windows using NTFS: / ? - Any other character that the target file system does not allow. Beca… [<>:"/\|? I know about regexp, however that is dependent on hard-coding certain characters to look for. Windows does not support folder names that end with a . - Any other character that the target file system does not allow. But as far as I know, it does have the scenario, some files may produced by the application and program or other operating system that exceed the path, could still be in the windows system. 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