How can I change this regex?

/^(?=.*\d)(?=.*[A-Za-z]).{6,}$/

At the moment it checks at least 1 number and at least one letter present.

How can I make it at least one number and at least 1 upper case letter??

Thanks all.

The part that matches the letter is [A-Za-z]. This is a character class, signified by the square brackets, meaning that it will match any single character specified inside the brackets. In this case, it will match any uppercase letter (A-Z) or lowercase letter (a-z). To make it match uppercase letters only, simply remove the lowercase part so it looks like this: [A-Z].