Look for part of a string in an array?

Question

i'm looking for an efficient way to look for certain words, would i use switch/case, int/string.IndexOf('!'); foreach loop/contains?

i have a string that i'm receiving from a client. so, let's say i get:

string x = "fjdswordslkjf?dkHEYw";

i have an array of possible values that correspond with that message. (none of this is syntactically correct, just so you get an idea):

someArray[0]= "?";
someArray[1]= "HEY";
someArray[2]= "find.me";

basically i want to know

 if (x contains someWordinSomeArray)

i want to search through the string x, using the words in the array. what would be the most efficient way to do this in c#? i just need a bool response, not the exact location in the string.

ANSWER

here's what i used:

foreach (string searchstring in valuesArray)
        {
            indx = test.IndexOf(searchstring);
            if (indx > -1)
            {
                testValue = true;
                break;
            }             
        }

Answer 1

Loop through the array, and exit as soon as you find a match:

bool found = someArray.Any(s => x.Contains(s));

A non-LINQ version of the same would be:

bool found = false;
foreach (string s in someArray) {
  if (x.Contains(s)) {
    found = true;
    break; // exit from loop
  }
}

Answer 2

You can use the appropriate extension method depending on exactly you want. Suppose that the input string is stored in s, and that the array of words you want to check is wordsToMatch. Then:

... if you want to know whether any of the words match:

var stringMatched = wordsToMatch.Any(w => s.Contains(w));
// true or false

... if you want to know which words match:

var matchingWords = wordsToMatch.Where(w => s.Contains(w));
// ["apple", "ban", "banana", "nana", "coconut", "nut", ...]

... if you want to know whether each word matches:

var wordMatchResult = wordsToMatch.Select(w => s.Contains(w));
// [true, true, false, true, false, true, ...]

Answer 3

The .NET framework has a string.contains method that does what you want to do. Loop through the array. For each item in the array, check if x.Contains(item) is true

http://msdn.microsoft.com/en-us/library/dy85x1sa.aspx

string s1 = "fjdswordslkjf?dkHEYw";
foreach (String s in array)
    b = s1.Contains(Array[item]);  //will be T or F

Answer 4

    bool CheckForString(string[] someArray,string x)
    {          
      foreach(string s in someArray)
        if(x.contains(s))
          return true;
      return false;
    }  

I think "contains" is faster than indexOf()