Unable to generate regex for username

Asked Jun 17 '20 at 12:06

Active Jun 17 '20 at 12:10

Viewed 22 times

Expectation: Min 6 and Max 30 characters. It can contain letters, numbers, and period( .), cannot begin and end with a period, consecutive period( . ) not allowed.

I'm trying to generate regex which is ^(?!\.)(?!.*\.$)(?!.*?\.\.)[a-zA-Z0-9_.]+$, but this is not working as expected

edited Jun 17 '20 at 12:10

asked Jun 17 '20 at 12:06

Bushra Saifi

Replace `+` with `{6,30}` – Wiktor Stribiżew Jun 17 '20 at 12:08
1

When posting questions, please provide actual descriptions of the problem; "not working as expected" is not one; you should instead explain what it does and why that is wrong. – underscore_d Jun 17 '20 at 12:08
You could also use a single lookahead for the number of characters `^(?=[a-zA-Z0-9_.]{6,30}$)[a-zA-Z0-9_]+(?:\.[a-zA-Z0-9_]+)*$` or shorter `^(?=[\w.]{6,30}$)\w+(?:\.\w+)*$` – The fourth bird Jun 17 '20 at 12:12
^(?=[\w.]{6,30}$)\w+(?:\.\w+)*$ wil this regex satisfy this condition :-cannot begin and end with a period, consecutive period( . ) not allowed. @Thefourthbird I – Bushra Saifi Jun 17 '20 at 12:17
The pattern starts and ends with a word char, and optionally contains a single period followed by 1 or more word chars. – The fourth bird Jun 17 '20 at 12:19
[https://regex101.com/ ] I'm unable to test this here. can you provide some test data @Thefourthbird – Bushra Saifi Jun 17 '20 at 12:23
See https://regex101.com/r/CSrgYY/1 – The fourth bird Jun 17 '20 at 12:24
this only needs to contain letters, numbers and period. which means no special character @Thefourthbird – Bushra Saifi Jun 17 '20 at 12:31

Unable to generate regex for username

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