Question

我有一个IEnumerable＆lt; DirectoryInfo＆gt;我想使用正则表达式数组过滤掉以找到潜在的匹配项。我一直在尝试使用linq加入我的目录和正则表达式字符串，但似乎无法正确使用它。这就是我要做的......

string[] regexStrings = ... // some regex match code here.

// get all of the directories below some root that match my initial criteria.
var directories = from d in root.GetDirectories("*", SearchOption.AllDirectories)
                  where (d.Attributes & (FileAttributes.System | FileAttributes.Hidden)) == 0
                        && (d.GetDirectories().Where(dd => (dd.Attributes & (FileAttributes.System | FileAttributes.Hidden)) == 0).Count() > 0// has directories
                            || d.GetFiles().Where(ff => (ff.Attributes & (FileAttributes.Hidden | FileAttributes.System)) == 0).Count() > 0) // has files)
                  select d;

// filter the list of all directories based on the strings in the regex array
var filteredDirs = from d in directories
                   join s in regexStrings on Regex.IsMatch(d.FullName, s)  // compiler doesn't like this line
                   select d;

...关于如何让这个工作的任何建议？

Answer 1

如果您只想要与所有正则表达式匹配的目录。

var result = directories
    .Where(d => regexStrings.All(s => Regex.IsMatch(d.FullName, s)));

如果您只想要与至少一个正则表达式匹配的目录。

var result = directories
    .Where(d => regexStrings.Any(s => Regex.IsMatch(d.FullName, s)));

Answer 2

我认为你所采取的方法无论如何都不是你想要的。这将检查所有正则表达式字符串的名称，而不是第一次匹配时的短路。此外，如果一个匹配多个模式，它将复制目录。

我想你想要这样的东西：

string[] regexStrings = ... // some regex match code here.

// get all of the directories below some root that match my initial criteria.
var directories = from d in root.GetDirectories("*", SearchOption.AllDirectories)
                  where (d.Attributes & (FileAttributes.System | FileAttributes.Hidden)) == 0
                        && (d.GetDirectories().Where(dd => (dd.Attributes & (FileAttributes.System | FileAttributes.Hidden)) == 0).Count() > 0// has directories
                            || d.GetFiles().Where(ff => (ff.Attributes & (FileAttributes.Hidden | FileAttributes.System)) == 0).Count() > 0) // has files)
                  select d;

// filter the list of all directories based on the strings in the regex array
var filteredDirs = directories.Where(d =>
    {
        foreach (string pattern in regexStrings)
        {
            if (System.Text.RegularExpressions.Regex.IsMatch(d.FullName, pattern))
            {
                return true;
            }
        }

        return false;
    });

Answer 3

您在联接前缺少Where关键字

使用正则表达式列表查找匹配的目录

3 个答案: