Question

如何在不显着影响性能的情况下将其重构为oneliner或至少某些本机函数？我将针对20个子字符串检查大约100个字符串。在使用5年的普通专业笔记本电脑上，这种情况不应持续超过200-300毫秒。

    ''' <summary>
    ''' Indicates whether the string includes at least one of the provided substrings.
    ''' </summary>
    ''' <param name="MyString">The string this extension applies to.</param>
    ''' <param name="SubStrings">The array of substrings that may be contained within the main string. Best performance when low index values contain the substrings the most likely to match.</param>
    <System.Runtime.CompilerServices.Extension()>
    Function ContainsAtLeastOneOf(MyString As String, SubStrings As String()) As Boolean

        For Each SubString As String In SubStrings
            If MyString.Contains(SubString) Then Return True
        Next

        Return False

    End Function

我发现了许多解决方案，人们在其中检查一组字符串都包含相同的子字符串，但是找不到与之相反的主题。我有几种解决方案，但似乎没有一种足够干净。我想必须有一种更明显的方法来实现这一目标。

目前，我能想到的选择是：

正则表达式：Text.RegularExpressions.Regex.IsMatch(MyString, string.format("{0}|{1}|{2}", SubStr1, SubStr2, SubStr3, ...))
丑陋的奥尔瑟：If MyString.Contains(SubStr1) OrElse MyString.Contains(SubStr2) OrElse ...
我的直觉是IEnumerable.Intersect(...)里有东西，但是那会在Char而不是String上循环。

c＃个答案是可以接受的。

Answer 1

这个怎么样

Module Module1

    Sub Main()

        Const so = "StackOverFlow"
        Dim t1 = Now
        For i = 0 To 100
            Console.WriteLine(so.ContainsAtLeastOneOf(New String() {"over1", "over"}, True))
        Next
        Console.WriteLine((Now - t1).TotalMilliseconds)
        Console.ReadLine()
    End Sub
    <System.Runtime.CompilerServices.Extension()>
    Function ContainsAtLeastOneOf(myString As String, subStrings As String(), Optional caseInsensitive As Boolean = False) _
        As Boolean

        If caseInsensitive Then
            Return subStrings.Any(Function(subString) myString.ToLower().Contains(subString.ToLower()))
        End If
        Return subStrings.Any(Function(subString) myString.Contains(subString))
    End Function
End Module

检查一个字符串是否包含至少一个存储在子字符串数组中的字符串

1 个答案: