RegEx to make sure that the string contains at least one uppercase and lowercase letter but also may include numbers and special characters

Question

What is the regex to make sure that a given string contains at least one lowercase character and one uppercase character but also my include number s and special characters !@#$%^&*()+=? ?

Does the order of the regex matter?

It would help to know which regex engine or text editor you are using, but generally speaking, a lookahead would give you this flexibility. — Kenneth K.
– Kenneth K., Commented Oct 16, 2018 at 17:21
I use this for password regex, at least 1 uppercase, 1 lowercase, 1 number, 1 special character, minimum 10 characters: /^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#\$%\^&\*])(?=.{10,})/ from thepolyglotdeveloper.com/2015/05/… — user1063287
– user1063287, Commented Oct 16, 2018 at 17:26
Possible duplicate of RegEx to make sure that the string contains at least one lower case char, upper case char, digit and symbol — Poul Bak
– Poul Bak, Commented Oct 16, 2018 at 17:55

blhsing · Accepted Answer · 2018-10-17 01:50:05Z

You can use positive lookahead patterns to ensure that there are at least one uppercase and one lowercase characters, while using a character set to cover the rest of the allowed characters:

^(?=[a-z0-9!@#$%^&*()+=?]*[A-Z])(?=[A-Z0-9!@#$%^&*()+=?]*[a-z])[A-Za-z0-9!@#$%^&*()+=?]*$

Demo: https://regex101.com/r/Uyy1aj/2

I want only numbers and special characters to the only other options.

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