如何在句子之前/之后得到一个单词 [英] how to get a word before/after in sentence

问题描述

我的文字现在文字很长，我搜索一个单词所以我想要在5个单词之后/之前得到这个单词例如

I have a text very longer now in text, I search one word so I wanna get after/before 5 word that word For example

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis venenatis erat diam, vel placerat

i search'elit'但在5个单词之前/之后根据该单词



dolor sit amet，consectetur adipiscing elit。 Duis venenatis erat diam，vel

喜欢这个



但也可能不够5个字



例如，我在文本上方搜索dolor。但是之前只有2个单词



所以


$ b $bı想得到

i search 'elit' but before/after 5 word according to that word

dolor sit amet, consectetur adipiscing elit. Duis venenatis erat diam, vel
Like this

but also can be not enough 5 word

For example I search 'dolor' above the text. but there are only 2 word before dolor

so

ı want to get

Lorem ipsum dolor sit amet, consectetur adipiscing elit

赞这样



我怎么能用C＃

like this

how can i do it with C#

推荐答案

这样的东西对你有用（注意你可能也想让搜索不区分大小写） 。

Something like this might work for you (note that you might want to make the search case-insensitive as well).

using System;
using System.Collections.Generic;
using System.Linq;

namespace Words
{
    class Program
    {

        static IEnumerable<int> IndexOf(IEnumerable<string> list, string searchItem)
        {
            var index = 0;
            foreach (var item in list.Select(w => w.Trim('.', ',', ';', '(', ')', '[', ']'))) // Get rid of trailing full stops etc
            {
                if (item.Equals(searchItem))
                    yield return index;

                ++index;
            }
        }

        static void Main(string[] args)
        {
            var text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis venenatis erat diam, vel placerat";
            var words = text.Split(' ');
            var searchWord = "dolor";

            // Loop here because the search word might appear more than once in the text
            foreach (var index in IndexOf(words, searchWord))
            {
                var before = words.Take(index).Skip(index - 5).Take(5);
                var after = words.Skip(index + 1).Take(5);
                Console.WriteLine(String.Join(" ", before) + " " + String.Join(" ", after));
            }
        }
    }
}

希望这有帮助，

Fredrik

Hope this helps,
Fredrik

非常感谢，

我也学到了答案，我们可以找到使用正则表达式如何？

Thank you a lot,
and also I have learnt a answer, we can find use regex how?

List<string> listSentences = new List<string>();
                    string pattern = "(?:[a-zA-Z'-]+[^a-zA-Z'-]+){0,10}" + word +
                                     "(?:[^a-zA-Z'-]+[a-zA-Z'-]+){0,10}";

                    MatchCollection matches = Regex.Matches(text.ToLower(), pattern);
                    for (int i = 0; i < matches.Count; i++)
                    {
                        string s = "<ul><li>" + matches[i].ToString() + "</li></ul>";
                        listSentences.Add(s.Replace(word, "<span style="color: red;">"+word+"</span>"));
                    }</string></string>

谢谢！

thank you !

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