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With a String s, to determine if it contains "a" or "b" or "c". Something that is better than checking each individually:
if (s.contains("a")||s.contains("b")||s.contains("c"))
If you are looking for single characters, you can use
String.IndexOfAny().If you want arbitrary strings, then I’m not aware of a .NET method to achieve that “directly”, although a regular expression would work.