c# - regex opltional matching groups

Question

Hi im trying to create a regex for the following expression

I need matching groups on all the integers

• Valid
  • integer-integer
  • integer-integer/integer
• Invalid
  • integer-integer/

So the first part would be like

^(\d+)-(\d+)

which matches 1-50

With these matching groups

• 1st group: 1
• 2nd group: 50

what do i need to add to the second part to make

/integer

optional but / should not be in the 3rd matching group and an integer is supplied

Answer 1

使用非捕获可选组，并在其中使用整数组。

这应该适合你：

^(\d+)-(\d+)(?:/(\d+))?$

Answer 2

将斜线放在非捕获组中，将斜线后面的数字放在捕获组中。

^(\d+)-(\d+)(?:/(\d+))?