Regex pattern is not correct

Question

I have the following regex to match this:
U$MichaelU$P@$asdqwe123P@$ - this is correct; the other two are not
U$NameU$P@$PasswordP@$
U$UserU$P@$ad2P@$

A registration is valid when:

The username is surrounded by "U$"
The username needs to be minimum 3 characters long, start with an uppercase letter, followed only by lowercase letters
The password is surrounded by "P@$"
The password needs to start with minimum 5 alphabetical letters (not including digits) and must end with a digit

My regex is

@"^(U\S)([A-z][a-z]{3,})\1(P@\S)([a-z]{5,}[^\d])([\d]+)\3$"

The problem is that it matches the first one but when I submit to the judge it passes first 2 test but the rest it breaks, could you please tell me where is my mistake.

You could go and use String.Split, first with "U$" and then with "P@$" instead of a regular expression — Lennart
– Lennart, Commented Dec 3, 2019 at 10:44
A registration is valid when: - The username is surrounded by "U$" - The username needs to be minimum 3 characters long, start with an uppercase letter, followed only by lowercase letters - The password is surrounded by "P@$" - The password needs to start with minimum 5 alphabetical letters (not including digits) and must end with a digit — DraksBG
– DraksBG, Commented Dec 3, 2019 at 10:45
Don't use \S to match a $. \S matches many other characters as well. Also, the regex looks for a minimum of 4 letters in the name, not 3, and 6 non-digits in the password, not 5. — Mr Lister
– Mr Lister, Commented Dec 3, 2019 at 10:48

EmreKalafat · Accepted Answer · 2019-12-03 10:59:03Z

2

Hello your regex must be

@"^(U\S)([A-Za-z]{3,})\1(P@\S)([A-Za-z0-9]{5,})\3$"

it works for you

answered Dec 3, 2019 at 10:59

EmreKalafat

1065 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

DraksBG Over a year ago

U$NameU$P@$PasswordP@$ it count thaht one too and it dosnet have to do it

EmreKalafat Over a year ago

@"^(U\S)([A-Z]{1}[a-z]{2,})\1(P@\S)([A-Za-z]{4,}[0-9]{1,})\3$" you want this but it's dont count U$UserU$P@$ad2P@$

DraksBG Over a year ago

thats the one now only one test dosent pas from 12

Collectives™ on Stack Overflow

Regex pattern is not correct

1 Answer 1

3 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Related