exports.damage = function(spellString) {

    let a = spellString.split("");
    let start = spellString.search(/fe/)+2;
    let stop = spellString.search(/ai/);
    let reg2 = spellString.lastIndexOf("ai")+2;

    let damage = 0;

    if (start > -1 && stop > -1) {
        damage +=1;

        for (let i = start; i < reg2; i++) {

            if (a[i] === "f" && a[i+1] === "e") {
              return 0;
            }

            //Checking for je and jee spellStrings
            else if (a[i] === "j") {
                if (a[i+1] === "e") {
                    if (a[i+2] === "e") {
                        damage += 3;
                        i += 2;

                    } else {
                        damage += 2;
                        i += 1;
                    }
                } else damage -= 1;
            }
            //Checking for ai, ain and ai-ne spellStrings
            else if (a[i] === "a") {
                if (a[i+1] === "i") {
                    if (a[i+2] === "n") {
                        if (a[i+3] === "e") {
                            damage +=4;
                            i+=3;
                        } else {
                            damage += 3;
                            i += 2;
                        }
                    } else {
                        damage += 2;
                        i += 1;
                    }
                } else damage -= 1;
            }
            //Checking for dai spellString
            else if (a[i] === "d") {
                if (a[i+1] === "a") {
                    if (a[i+2] === "i") {
                        damage += 5;
                        i += 2;
                    } else damage -= 1;
                } else damage -= 1;
            }

            else damage -= 1;

        }
    } else return 0;

    if (damage > 0) {
        return damage;
    } else return 0;
};