How Can I Efficiently Check if a String Contains Any or All Substrings from an Array in C#?

Finding Substrings in Strings with C#

In C#, you can efficiently ascertain whether a string contains any substring from a specified string array. Let's consider an example:

string stringToCheck = "text1text2text3";
string[] stringArray = { "text1", "someothertext", etc... };

To check if stringToCheck contains any substring from stringArray, you can employ the following technique:

if (stringArray.Any(stringToCheck.Contains))

This expression uses the LINQ (Language Integrated Query) extension method Any to check whether any of the elements in stringArray are also present as substrings in stringToCheck.

Alternatively, a longer but clearer version of the above code would be:

if (stringArray.Any(s => stringToCheck.Contains(s)))

For a more stringent check, you can use the All method to ensure that stringToCheck contains all substrings from stringArray:

if (stringArray.All(stringToCheck.Contains))

This method will return true only if stringToCheck contains every substring from stringArray. By utilizing these techniques, you can effectively determine whether a string contains any or all substrings from a predefined string array.

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