C # Contains a few words not together

Question

if (r.Contains("Word1" + "Word2")) 

This code checks if "Word1" and "Word2" are in a string together, for example. nothing in between, but how to check if a string contains these two words regardless of order or any other words between them?

eg. Returns true if string

  Word1Word2 

Returns false

  Word1 Text Word2 

Answer 1

Just make sure every word is in r .

 if (r.Contains("Word1") && r.Contains("Word2")) 

This code checks for the existence of "Word1" AND "Word2" inside the source string, regardless of its relative position within the string.

Edit:

As @Alexei Levenkov (+1) notes, it can be found using the IndexOf method.

 if (r.IndexOf("Word1", StringComparison.InvariantCultureIgnoreCase) > -1 && r.IndexOf("Word2", StringComparison.InvariantCultureIgnoreCase) > -1)) 

Answer 2

Make sure that each word is contained in a line:

 if (r.Contains("Word1") && r.Contains("Word2"))) 

If you do this often, you can improve readability (IMO) and brevity by creating an extension method:

 public static bool ContainsAll(this string source, params string[] values) { return values.All(x => source.Contains(x)); } 

Used as:

 "Word1 Text Word2".ContainsAll("Word1", "Word2") // true 

Answer 3

To do this, you can use the && operator:

 if (r.Contains("Word1") && r.Contains("Word2")) 

Please note that this will verify that both words are in any order. If you need to make sure that the first word precedes the second, get the indices of each word and check that the index of the first word is lower than the index of the second:

 var ind1 = r.IndexOf("Word1"); var ind2 = r.IndexOf("Word2"); if (ind1 >= 0 && ind2 > ind1) { ... }