代码之家 › 专栏 › 技术社区 › Scott Ivey

使用正则表达式列表查找匹配的目录

directoryinfo linq regex c#

Scott Ivey · 技术社区 · 16 年前

我有一个IEnumerable<directoryInfo>,我想使用一个正则表达式数组来筛选,以查找潜在的匹配项。我一直在尝试使用linq加入我的目录和regex字符串,但似乎不能正确地加入。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;

…我有什么建议可以让这个工作吗?

3 回复 | 直到 16 年前

Daniel Brückner 16 年前

如果只需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)));

如果只需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)));

Adam Robinson 16 年前

我不认为你所采取的方法正是你想要的。这将对照所有regex字符串检查名称,而不是在第一个匹配项上进行短路。另外,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;
    });