正则表达式匹配文件名

Question

我试图找出正则表达式与引号中的文件名匹配的内容.例如.

blah blah rubarb "someFile.txt" blah
rubard "anotherFile.txt" blah blah

我想要配对

someFile.txt
anotherFile.txt

我正在使用.NET.我现在正在阅读文档,但任何帮助非常感谢.

Answer 1

试试这个:

(?<=")\w+\.\w+(?=")

这不包括比赛中的引号.

注意:我用这个正则表达式做了一个假设.我假设文件名只包含一个.字符.所以my.file.txt不会匹配.如果您需要匹配,请告诉我,我会更新它.

下面介绍如何在c#代码中使用它来迭代所有匹配项.

try {
    Regex regexObj = new Regex(@"(?<="")\w+\.\w+(?="")");
    Match matchResults = regexObj.Match(subjectString);
    while (matchResults.Success) {
        // matched text: matchResults.Value
        // match start: matchResults.Index
        // match length: matchResults.Length
        matchResults = matchResults.NextMatch();
    } 
} catch (ArgumentException ex) {
    // Syntax error in the regular expression
}

这里有一些评论可以帮助您理解它:

@"
(?<=    # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind)
   ""       # Match the character “""” literally
)
\w      # Match a single character that is a “word character” (letters, digits, and underscores)
   +       # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
\.      # Match the character “.” literally
\w      # Match a single character that is a “word character” (letters, digits, and underscores)
   +       # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
(?=     # Assert that the regex below can be matched, starting at this position (positive lookahead)
   ""       # Match the character “""” literally
)
"