On 12/23/20 10:03 AM, Sadaka Technology wrote:
hello guys,I have this pattern for password validation (regex): I want these rules to be applied: Minimum 8 characters. The alphabets must be between [a-z] At least one alphabet should be of Upper Case [A-Z] At least 1 number or digit between [0-9]. At least 1 character from [ _ or @ or $ ]. and this pattern: passwordpattern = "^(?=.[a-z])(?=.[A-Z])(?=.\d)(?=.[@$])[A-Za-z\d@$!%?&]{8,}.$" my only issue is that I want to add the symbol () and symbol(.) in the pattern where only it accepts $ and @, I tried adding generally like [@_$] not working
I'm not going to answer your question, don't have the brainpower at the moment to disentangle your regex.
Therein comes the source of the (unasked-for) comment: if looking at a regex gives you a headache - and worse, it doesn't work as you hope, you probably want to solve a problem another way.
If you're enforcing a password policy (and this isn't a homework question, where the rules conveniently don't change over time), I'd claim you're better off writing a readable routine that applies the policy in such a way that you can accommodate changes to the policy. What if someone decides that the non-alnum set can also include a comma or other characters? What if there's a different constraint applied to the first character of the password? (both of those are moderately common).
Telling someone the password they tried to propose doesn't meet the policy isn't performance sensitive, since it is a human-interactive process, so it's okay to be a little slower and a lot clearer (that's not even a Python issue!)
If you're going to stick with a regex, run the completed regex through one of the online validators, and paste its analysis (they usually give you a breakdown of what each piece means) as a comment, so some future programmer has a hope...
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