p2_strInStr = {
    _needle = _this select 0;               //needle input      "wo"
    _haystack = _this select 1;             //haystack input    "hello world"
    _needle = strToArray(_needle);          //converts to: ["w","o"];
    _haystack = strToArray(_haystack);      //converts to: ["h","e","l","l","o"," ","w","o","r","l","d"];
    _needleLength = count (_needle);        //converts to: 2
    _foundCount = 0;                        //used later
    _foundPos = 0;                          //^
    _return = 0;                            //output for later
    _continue = true;                       //used later

    //for each item in the haystack, each letter in hello world...
    {
        //if the first letter of the needle (w), matches any of the characters in the haystack, then run some code...
        if (_haystack select _foundPos == _needle select 0) then {
            //firstly, add 1 to foundCount...we'll use it later
            _foundCount = 1;
            //this tells it to continue searching the haystack for other matching chars
            _continue = true;
            //while the length of wo, aka 2, is greater than the amount of letters its found we need to keep searching the haystack for the rest of the matching characters
            //we also check if continue is still true
            while ((_needleLength ) > _foundCount && _continue == true) {
                if (_haystack select (_foundPos + 1)) then {
                    _foundCount = _foundCount + 1; //stops the loop if it finds all the letters
                    _continue = true;             // keeps the loop going if it hasnt found them all
                } else {
                    _foundCount = 0;               //reset foundCount
                    _continue = false;              //end the loop, so it continues to the next letter in the haystack
                };
            };

            _foundPos = _foundPos + 1;          //continue to next letter in haystack once loop has ended
        };

    } count _haystack;

    //once its done, if foundcount is the same as needle length then it did find the full length of wo in hello world.
    if (_foundCount == (_needleLength -1)) then {
        _return = _foundPos;    //set the return output to the position in hello world that it found wo
    } else {
        _return = 0;            //if foundcount not same as needle lenght, string was not found, return 0, a failure.
    };

    _return
};