Using C# to check if string contains a string in string array

Question

I want to use C# to check if a string value contains a word in a string array.

For example:

string stringToCheck = "text1text2text3";

string[] stringArray = { "text1", "someothertext" };

if (stringToCheck.Contains(stringArray)) // Is one of the items?
{

}

How can I check if the string value for stringToCheck contains a word in the array?

This blog benchmarks numerous techniques for testing if a string contains a string: blogs.davelozinski.com/curiousconsultant/… — Robert Harvey
– Robert Harvey, Commented Oct 2, 2013 at 0:45
This is a prime candidate for a meta question about highly upvoted incorrect answers. Is there already one? — Peter Mortensen
– Peter Mortensen, Commented Apr 21, 2022 at 22:26

Pankaj Goel · Accepted Answer · 2025-04-11 18:17:55Z

-1

Simple and Easy way.

string stringToCheck = "hi this is text1";
string[] givenStringArray = { "text1", "testtest", "test1test2", "test2text1" };

bool included = givenStringArray.Any(x =>
stringToCheck.ToUpper().Contains(x.ToUpper()));

answered Apr 11 at 18:17

Pankaj Goel

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Comments

radbyx · Accepted Answer · 2012-04-04 22:59:32Z

-2

I used the following code to check if the string contained any of the items in the string array:

foreach (string s in stringArray)
{
    if (s != "")
    {
        if (stringToCheck.Contains(s))
        {
            Text = "matched";
        }
    }
}

edited Apr 4, 2012 at 22:59

radbyx

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answered May 26, 2010 at 13:28

Theomax

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1 Comment

Dour High Arch Over a year ago

This sets Text = "matched" as many times as stringToCheck contains substrings of stringArray. You may want to put a break or return after the assignment.

Steve · Accepted Answer · 2017-03-23 13:28:59Z

Three options demonstrated. I prefer to find the third as the most concise.

class Program {
    static void Main(string[] args) {
    string req = "PUT";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("one.1.A");  // IS TRUE
    }
    req = "XPUT";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("one.1.B"); // IS TRUE
    }
    req = "PUTX";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("one.1.C");  // IS TRUE
    }
    req = "UT";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("one.1.D"); // false
    }
    req = "PU";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("one.1.E"); // false
    }
    req = "POST";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("two.1.A"); // IS TRUE
    }
    req = "ASD";
    if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
        Console.WriteLine("three.1.A");  // false
    }


    Console.WriteLine("-----");
    req = "PUT";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("one.2.A"); // IS TRUE
    }
    req = "XPUT";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("one.2.B"); // false
    }
    req = "PUTX";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("one.2.C"); // false
    }
    req = "UT";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("one.2.D"); // false
    }
    req = "PU";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("one.2.E"); // false
    }
    req = "POST";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("two.2.A");  // IS TRUE
    }
    req = "ASD";
    if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0)  {
        Console.WriteLine("three.2.A");  // false
    }

    Console.WriteLine("-----");
    req = "PUT";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("one.3.A"); // IS TRUE
    }
    req = "XPUT";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("one.3.B");  // false
    }
    req = "PUTX";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("one.3.C");  // false
    }
    req = "UT";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("one.3.D");  // false
    }
    req = "PU";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("one.3.E");  // false
    }
    req = "POST";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("two.3.A");  // IS TRUE
    }
    req = "ASD";
    if ((new string[] {"PUT", "POST"}.Contains(req)))  {
        Console.WriteLine("three.3.A");  // false
    }

    Console.ReadKey();
    }
}

Your second two options don't even do the same thing at the first one.

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