Compare and extract common words between 2 strings

Question

In ASP.NET C# and assuming I have a string contains a comma separated words:

string strOne = "word,WordTwo,another word, a third long word, and so on";

How to split then compare with another paragraph that might and might not contain these words:

string strTwo = " when search a word or try another word you may find that  WordTwo is there with others";

Then how to output these common words departed with commas in a third string

string strThree = "output1, output2, output3";

To get a result like : "word, WordTwo, another word,"

What has this got to do with asp.net. isn't this just a C# question? — TheGeneral, Apr 21 '18 at 02:45
split `strOne` by comma and split `strTwo` by space. And then use `intersect` LINQ method to get the common words existing in both the arrays. https://stackoverflow.com/questions/10323071/intersection-of-two-string-array-ignore-case — Chetan, Apr 21 '18 at 02:48
may be because i'm building an ASP.NET app :), shall remove it :) — hsobhy, Apr 21 '18 at 02:48

score 4 · Accepted Answer · answered Apr 21 '18 at 03:14

You will need to split strOne by comma, and use a contains against strTwo.

Note: You can't split strTwo by space and use intersect because your items may have spaces. i.e. "another word"

string strOne = "word,WordTwo,another word, a third long word, and so on";
string strTwo = " when search a word or try another word you may find that  WordTwo is there with others";
var tokensOne = strOne.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

var list = tokensOne.Where(x => strTwo.Contains(x));

var result = string.Join(", ",list);

Thanks @Drew worked for me and testing both with different scenarios — hsobhy, Apr 21 '18 at 03:27

score 2 · Answer 2 · answered Apr 21 '18 at 03:00

2

You could do something like this:

        string strOne = "word,WordTwo,another word, a third long word, and so on";
        string strTwo = " when search a word or try another word you may find that  WordTwo is there with others";
        string finalString = string.Empty;

        foreach (var line in strOne.Split(","))
        {
            if(strTwo.Contains(line))
                finalString += (line + ",");
        }

        finalString = finalString.Substring(0, finalString.Length - 1);
        Console.WriteLine(finalString);

answered Apr 21 '18 at 03:00

Jimmy JimJim

21
2

2

Good answer. If you use a `List` for `finalString`, you can then `string.Join` it to make it comma separated. – CodingYoshi Apr 21 '18 at 03:10
2

If not `string.Join` then consider using `StringBuilder` for `finalString` instead of concatenating the strings each time. – Gilad Green Apr 21 '18 at 03:17
strOne.Split(",") isn't valid. See hsobhy's comment – Drew Sumido Apr 21 '18 at 03:19
1

strOne.Split(',') instead – hsobhy Apr 21 '18 at 03:21

Compare and extract common words between 2 strings

2 Answers2

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