How to check if a string contains all of the characters of a word

Question

I wish to check if a string contains a all of the characters of a word given, for example:

var inputString = "this is just a simple text string";

And say I have the word:

var word = "ts";

Now it should pick out the words that contains t and s :

this just string

This is what I am working on:

var names = Regex.Matches(inputString, @"\S+ts\S+",RegexOptions.IgnoreCase);

however this does not give me back the words I like. If I had like just a character like t , it would give me back all of the words that contains t . If I had st instead of ts , it would give me back the word just .

Any idea of how this can work ?

Answer 1

Here is a LINQ solution which is easy on the eyes more natural than regex.

var testString = "this is just a simple text string";
string[] words = testString.Split(' ');
var result = words.Where(w => "ts".All(w.Contains));

The result is:

this
just
string

Answer 2

You can use LINQ's Enumerable.All :

var input = "this is just a simple text string";
var token = "ts";

var results  = input.Split().Where(str => token.All(c => str.Contains(c))).ToList();

foreach (var res in results)
    Console.WriteLine(res);

Output:

// this
// just
// string

Answer 3

You can use this pattern.

(?=[^ ]*t)(?=[^ ]*s)[^ ]+

You can make regex dynamically.

var inputString = "this is just a simple text string";
var word = "ts";

string pattern = "(?=[^ ]*{0})";
string regpattern = string.Join("" , word.Select(x => string.Format(pattern, x))) + "[^ ]+";

var wineNames = Regex.Matches(inputString, regpattern ,RegexOptions.IgnoreCase);

Answer 4

Option without LINQ and Regex (just for fun):

string input = "this is just a simple text string";
char[] chars = { 't', 's' };
var array = input.Split();
List<string> result = new List<string>();
foreach(var word in array)
{
    bool isValid = true;
    foreach (var c in chars)
    {
        if (!word.Contains(c))
        {
            isValid = false;
            break;
        }
    }
    if(isValid) result.Add(word);
}