Today I Learned

If you want to validate a field in js for example a password field, you can use the regex, is a sequence of characters that forms a search pattern
I have the pwdField
and my const to test is const validPwd = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])([A-Za-z\d$@$!%*?&]|[^ ]){8,}$/;

Min 8 characters
at least one uppercase or lowercase letter
contains $@$!%*?&

You can use the test method to validate the field.
Example:

    const getPwdAndValidate = (pwdField, pwdField2) => {
    const validPwd = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])([A-Za-z\d$@$!%*?&]|[^ ]){8,}$/;
        if (pwdField === pwdField2 && validPwd.test(pwdField) && pwdField.length >= 8) {
            return pwdField;
        } else {
            return null;
        }
    };