How do I exclude consecutive characters?

Question

My pattern is

^[a-z0-9][a-z0-9\-_.]*[a-z0-9\-_]$

I want to exclude one or more consecutive periods.

1.1.1.1 -----> GOOD
1..1.1.1 ------> BAD

Thank you for your help.

What is the Regex flavor you are using? Different tools supports different functionalities for Regex. — Jorge Campos, Jul 21 '22 at 02:10
you can refactor: `^[a-z0-9](?:[.]?[a-z0-9\-_]+)*$` https://regex101.com/r/QUAGVv/1 — jhnc, Jul 21 '22 at 02:22

score 0 · Answer 1 · answered Jul 21 '22 at 02:56

0

If just want to avoid any occurrence of dots being adjacent to each other, try the word boundary meta escape \b.

/\b[.]\b/g

answered Jul 21 '22 at 02:56

zer00ne

1 Answers1