Positive and Negative Lookahead help please

JavaScript
#1

In the code:

let password = "abc123";
let checkPass = /(?=\w{3,6})(?=\D*\d)/;
checkPass.test(password);

I do not know why they put D* in there, I mean they just want to have at least one number right, so to me having only \d is enough. Can you explain that to me.Thank you

#2

Hey there! We can’t see your code right now.

1 Like
#3

Hi, I have added my code in here

#4

We are talking about this step?

for future: Try to provide links to challenges also

1 Like
#5

yes, and I just want to ask about the second example, the D* regular expression part

#6

\D means non-digit part of regular expression

#7

lets do some deciphering
note: to my experience deciphering is effective method to learn regexps

\D >>> non digital character
\D* >>> zero or more non digital characters
\d >>> digital character

whole thing:

\D*\d >>>>>>> zero or more non-digits followed by digital character

Also. Consider to look into this topic

#8

Oh, thank you, that a really really great answer :heart_eyes: