String compare Upper/Lower

Quoting FX-man

Disliked

Hi

if i want to compare some Strings then i have the problem some strings are in Uper and Lower Characters other strings are only in Lower Character so i can not compare it.
I am looking for a posibility to compare 2 strings and the Character (Big or Smale) is the same.

Thanks for your help

Thomas

Ignored

string stringToLowerCase(string str) {
    int lS = 97, lE = 122, uS = 65, uE = 90, diff = lS - uS;
    for (int i = 0; i < StringLen(str); i++) {
        int code = StringGetChar(str, i);
        if (code >= uS && code <= uE) {
            code += diff;
            str = StringSetChar(str, i, code);
        }
    }
    return (str);
}

bool stringEqualsIgnoreCase(string str1, string str2) {
    return (stringToLowerCase(str1) == stringToLowerCase(str2));
}