CODEWITHSUNDEEP
c#linq
Baby Dolphin
Baby Dolphin

Reputation: 489

Linq statement to get a string that is not substring of a longer string

I have a long string S that may contain pattern p1, p2, p3, ....;

All patterns are put in a MatchCollection object

I would like to do something like

string ret=p_n if !(S.Contains(p_n))

I write a for loop to do this

foreach(string p in PatternList)
{
   s=(!S.contain(p.valus))?p.value:"";
}

I would like to know a LINQ statement to make my cocde more elgant.

Upvotes: 3

Views: 226

Answers (3)

vinodpthmn
vinodpthmn

Reputation: 1062

    static void Main(string[] args)
    {
        string S = "p1, p2, p3, p4, p5, p6";

        List<string> PatternList = new List<string>();

        PatternList.Add("p2");
        PatternList.Add("p5");
        PatternList.Add("p9");

        foreach (string s in PatternList.Where(x => !S.Contains(x)))
        {
            Console.WriteLine(s);
        }

        Console.ReadKey();
    }

Upvotes: 0

Wil P
Wil P

Reputation: 3371

class Program
{
    static void Main(string[] args)
    {
        string S = "12345asdfasdf12w3e412354w12341523142341235123";

        string patternString = "one1234554321asdf";


        MatchCollection p_ns = Regex.Matches(patternString, "one|12345|54321|asdf");

        var nonMatches = (from p_n in p_ns.Cast<Match>()
                          where !S.Contains(p_n.Value)
                          select p_n.Value);

        foreach (string nonMatch in nonMatches)
        {
            Console.WriteLine(nonMatch);
        }
        Console.ReadKey();
    }
}

Or to use Justin's method from his answer you could also use the below variation.

class Program
{
    static void Main(string[] args)
    {
        string S = "12345asdfasdf12w3e412354w12341523142341235123";

        string patternString = "one1234554321asdf";


        MatchCollection p_ns = Regex.Matches(patternString, "one|12345|54321|asdf");

        var nonMatches = p_ns.Cast<Match>().Where(s => !S.Contains(s.Value));

        foreach (Match nonMatch in nonMatches)
        {
            Console.WriteLine(nonMatch.Value);
        }


        Console.ReadKey();
    }
}

Upvotes: 0

Justin Niessner
Justin Niessner

Reputation: 245399

var patterns = new List<string> { "one", "two", "three" };

var misses = patterns.Where(s => !longString.Contains(s));

Upvotes: 4

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