RegEx to validate a string, whether it contains at least one lower case char, upper case char, one digit,one symbol and no whitespace

Question

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RegEx to make sure that the string contains at least one lower case char, upper case char, digit and symbol

What would be the regex to make sure that a given string contains at least one character from each of the followings ---

• upper case letter
• lower case letter
• no whitespace
• digit
• symbol
• string length is >=5 and <=10

how to combine all these above criteria to validate a string.

Answer 1

If it has to be a regex:

^            # Start of string
(?=.*[A-Z])  # upper case (ASCII) letter
(?=.*[a-z])  # lower case letter
(?=.*\d)     # digit
(?=.*[\W_])  # symbol
\S           # no whitespace
{5,10}       # string length is >=5 and <=10
$            # end of string

or, if your regex flavor doesn't support verbose regexes:

^(?=.*[A-Z])(?=.*[a-z])(?=.*\d)(?=.*[\W_])\S{5,10}$