在Windows上验证文件名 [英] Validate a file name on Windows

问题描述

public static boolean isValidName(String text)
{
    Pattern pattern = Pattern.compile("^[^/./\\:*?\"<>|]+$");
    Matcher matcher = pattern.matcher(text);
    boolean isMatch = matcher.matches();
    return isMatch;
}

此方法是否保证Windows上的有效文件名？

Does this method guarantee a valid filename on Windows?

推荐答案

考虑到之前引用MSDN文档，以下正则表达式应该做得很好：

Given the requirements specified in the previously cited MSDN documentation, the following regex should do a pretty good job:

public static boolean isValidName(String text)
{
    Pattern pattern = Pattern.compile(
        "# Match a valid Windows filename (unspecified file system).          \n" +
        "^                                # Anchor to start of string.        \n" +
        "(?!                              # Assert filename is not: CON, PRN, \n" +
        "  (?:                            # AUX, NUL, COM1, COM2, COM3, COM4, \n" +
        "    CON|PRN|AUX|NUL|             # COM5, COM6, COM7, COM8, COM9,     \n" +
        "    COM[1-9]|LPT[1-9]            # LPT1, LPT2, LPT3, LPT4, LPT5,     \n" +
        "  )                              # LPT6, LPT7, LPT8, and LPT9...     \n" +
        "  (?:\\.[^.]*)?                  # followed by optional extension    \n" +
        "  $                              # and end of string                 \n" +
        ")                                # End negative lookahead assertion. \n" +
        "[^<>:\"/\\\\|?*\\x00-\\x1F]*     # Zero or more valid filename chars.\n" +
        "[^<>:\"/\\\\|?*\\x00-\\x1F\\ .]  # Last char is not a space or dot.  \n" +
        "$                                # Anchor to end of string.            ", 
        Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE | Pattern.COMMENTS);
    Matcher matcher = pattern.matcher(text);
    boolean isMatch = matcher.matches();
    return isMatch;
}

请注意，此正则表达式不对任何长度施加任何限制文件名，但实际文件名可能限制为260或32767个字符，具体取决于平台。

Note that this regex does not impose any limit on the length of the filename, but a real filename may be limited to 260 or 32767 chars depending on the platform.

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