trying to match keyword in a string that in the form of a sentence

August 23, 2022

I have tried two different way to search this string and match it to the Appendixkeywords string. I have tried using Array.Exists and Array.IndexOf but both are not finding the Appendixkeywords. Any help would be great.

working sample

https://dotnetfiddle.net/QIXFDn

>Solution :

I assume you want to check whether your source string contains any of the strings specified in your Appendixkeywords array. Additionally I assume you want to achieve a case insensitive comparison.

bool foundAnyAppendixWord = Appendixkeywords
    .Any(word => source
        .Contains(word, StringComparison.InvariantCultureIgnoreCase));

You could (and maybe even should) turn this easily into a reusable method

static bool ContainsAnySearchWord(string[] searchWords, string target)
{
    return searchWords.Any(word => target
         .Contains(word, StringComparison.InvariantCultureIgnoreCase));
}

// ...

bool foundAnyAppendixWord = ContainsAnySearchWord(Appendixkeywords, source);

.NET Framework (and older) versions:

static bool ContainsAnySearchWord(string[] searchWords, string target)
{
    return searchWords.Any(word => target.ToLower()
         .Contains(word.ToLower()));
}