c# - 在具有特定条件的字符串中搜索子字符串

Question

我想弄清楚，什么是在其他字符串中搜索子字符串以获得内容示例的相等输出的正确方法:

hello how are you

输入为真:

hey hello how are you ok
how are you 
are you 

错误的是:

you
how you are ok you
howareyou
howok
how you
hey hello

我想要一个字符串中包含的相同短语或部分短语为真，但不是单个单词或另一个序列中的单词。这样对于所有 (aList.Any(input.Contains)) 都是真的，对于所有 (aList.Contains(input)) 都是假的:

        List<string> aList = new List<string>() {
                                                 "hey hello how are you ok",
                                                 "how are you",
                                                 "are you",
                                                 "you",
                                                 "how you are ok you",
                                                 "howareyou",
                                                 "howok",
                                                 "how you",
                                                 "hey hello" };

            string input = "hello how are you";  

            foreach (string a in aList)
            {
                if (a.Any(input.Contains))
                {
                    Console.WriteLine(a + " - true");
                }
                else
                {
                    Console.WriteLine(a + " - false");
                }
            }

            Console.WriteLine("__\n\r");

            foreach (string a in aList)
            {
                if (a.Contains(input))
                {
                    Console.WriteLine(a + " - true");
                }
                else
                {
                    Console.WriteLine(a + " - false");
                }
            }

Answer 1

我想到了这个解决方案:

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        List<string> aList = new List<string>()
        {"hey hello how are you ok", "how are you", "are you", "you", "how you are ok you", "howareyou", "howok", "how you", "hey hello"};


        var input = "hello how are you";

        // build matcher
        string[] chunks = input.Split(' ');
        string matcher = "";
        for (int i = chunks.Length, j = 0; i > 1; i--, j++){
            var matcherPart = new string [i];
            Array.Copy(chunks, j, matcherPart, 0, i);
            matcher += "("+String.Join(@"+\s+", matcherPart) + ")";
        }
        matcher = matcher.Replace(")(", ")|(");

        // Console.WriteLine(matcher);
        //(hello+\s+how+\s+are+\s+you)|(how+\s+are+\s+you)|(are+\s+you)";


        foreach (string a in aList)
        {
            Regex r = new Regex(matcher, RegexOptions.IgnoreCase);
            Match m = r.Match(a);
            Group g = m.Groups[0];
            Console.WriteLine(a + " - " + (g.Captures.Count > 0));
        }

        /*

        hey hello how are you ok - True
        how are you - True
        are you - True
        you - False
        how you are ok you - False
        howareyou - False
        howok - False
        how you - False
        hey hello - False

        */
    }
}

构建匹配器部分使用可能的组合创建正则表达式，即此字符串 a b c d 正在转换为:(a+b+c+d)|(b+c+d) |(c+d)。有了它，您可以轻松地遍历列表值并应用正则表达式。 g.Captures.Count 告诉您列表项是否与您的模式匹配。