class regexp{
    str: string;
    check: string;
    op(str: string, check: string) {
        this.str = str;
        this.check = check;
        var count = 0;
        var count1: number=0;
        for (let i = 0; i < this.str.length; i++){
            count = i;
            if (str[i] == check[0]) {
                for (let j = 1; j < this.check.length; j++){
                    ++count;
                    if (this.str[count] == this.check[j])
                        count1++;
                }
            }
        }
        if (count1 + 1 == this.check.length)
            console.log("The checking string is an regular expession");
        else
            console.log("The checking string is not an regular expession");
    }
}
var s = new regexp();
s.op("sridhar", "ridh");