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

What is the regex to make sure that a given string contains at least one character from each of the following categories.

• Lowercase character
• Uppercase character
• Digit
• Symbol

I know the patterns for individual sets namely [a-z], [A-Z], \d and _|[^\w] (I got them correct, didn't I?).

But how do I combine them to make sure that the string contains all of these in any order?

Bart Kiers, your regex has a couple issues. The best way to do that is this:

(.*[a-z].*)       // For lower cases
(.*[A-Z].*)       // For upper cases
(.*\d.*)          // For digits

In this way you are searching no matter if at the beginning, at the end or at the middle. In your have I have a lot of troubles with complex passwords.

You can match those three groups separately, and make sure that they all present. Also, [^\w] seems a bit too broad, but if that's what you want you might want to replace it with \W.