#!/usr/bin/rdmd

​

void main()

{

    import std.experimental.all;

    string s1 = "aaa111aaa";

    string s2 = "aaa222aaa";

    string s3 = "aaa333aaa";

    string s4 = "aaa444aaa";

    const hay = [s1, s2, s3, s4];

    assert(canFind(s1, "111"));

    assert(hay.canFind!(e => e.canFind("111")));

}

​