Check if string equals (at least the first 2 letters) and containing a number

I've a list with some Strings, want to compare the strings and save the matching strings in a new list.

Matching means, that:

• the first 2 characters have to be letters


• the letters (at least the first 2 letters) have to be equal


• and it have to appear a number after the equal letters

---

List<String> items = new List<string>()
    {
        "ne1234",
        "ne2abc",
        "type",
        "12345"
        "12346"
        "s0",
        "s1",
        "numb4er",
        "numb5er",
        "numb8er",
        "tax1-0",
        "tax1-1"
    };

List<String> equalitems = new List<string>();

---

Content of equalitems

• ne*


• numb*


• tax*

I can't find a good approach to solve this. Has somebody an idea?