Password validation REGEX to disallow whitespaces

Question

• Password cannot contain white spaces
• must contain at least one numeric char
• must contain 1 capital letter
• and be at least 8 characters in le

Answer 1

Just match:

^(?!.* )(?=.*\d)(?=.*[A-Z]).{8,15}$

How it works:

.{8,15} means: 8 to 15 characters

(?!.* ) means: does not contain " "
(?=.*\d) means: contains at least one digit.
(?=.*[A-Z]) means: contains at least one capital letter