kosaraju-algorithm - Regex pattern in JavaScript to test for dots/hyphens in names

Question

Required regex pettern like

1. allow only letters with min 1 dot and maximum 3 dots.
2. allow optional as '-' special character.

Ex: raj.gopal-reddy or raj.reddy.gopal

Answer 1

您当前的正则表达式处于正确的轨道上，我会使用否定的前瞻来断言不会出现三个以上的点。考虑这种模式：

^(?!.*\..*\..*\..*\.)[A-Za-z-]*\.[A-Za-z-]*$