Where C#

// The LINQ Where can be used to filter in a collection.
// It will return a Enumerable that contains all of the matching elements

var names = new List<string>() {"John", "Jane", "William"};

//I use ToLower to get any name that contains a J, Capital or not.
var namesWithJ = names.Where(n => n.ToLower().Contains("j"));

//Returns IEnumerable<string> that contains ["John", "Jane"]

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