how to get a word before/after in sentence

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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' 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

like this

how can i do it with C#

Posted 11-Jul-13 18:14pm

ammoti

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Sushil Mate 12-Jul-13 0:34am

spilt the sentence by spaces, dot, comma what not & put it into array. search in the array where ever you find that word take next 5 elements from the array.

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Fredrik Bornander · Accepted Answer · 2013-07-11T18:37:00

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

C#

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));
            }
        }
    }
}

Hope this helps,
Fredrik

ammoti · Accepted Answer · 2013-07-11T18:41:00

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

C#

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>

thank you !

how to get a word before/after in sentence

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