C# 使用正则表达式列表查找匹配的目录

我有一个IEnumerable，我想使用一个正则表达式数组来筛选它，以找到潜在的匹配项。我一直在尝试使用linq连接我的目录和正则表达式字符串，但似乎无法正确连接。这就是我想做的

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;

---

。。。有什么建议吗？

您在加入前缺少了Where关键字

您在加入前缺少了Where关键字

我不认为您所采取的方法正是您想要的。这将根据所有正则表达式字符串检查名称，而不是在第一次匹配时短路。此外，如果一个匹配多个模式，它将复制目录

我想你想要的是：

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;
    });

---

我不认为你采取的方法正是你想要的。这将根据所有正则表达式字符串检查名称，而不是在第一次匹配时短路。此外，如果一个匹配多个模式，它将复制目录

我想你想要的是：

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;
    });

---

如果您只需要匹配所有正则表达式的目录

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

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

---

如果您只希望目录至少匹配一个正则表达式

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

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

---

如果您只需要匹配所有正则表达式的目录

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

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

---

如果您只希望目录至少匹配一个正则表达式

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

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

Doh！-我也总是忘记那些（任何&所有的）事情我也总是忘记那些（任何&所有的）。