What is the regular expression to match the empty string for a rewrite rule?

问题

I need a regular expression for a rewrite rule on iis7, I'm trying to redirect http://www.website.com to http://www.website.com/sample. But I only want the empty url string (extra points if you can figure it out with and without '/'), and I'm unsure how to create a rewrite rule to match to that.

Can someone help me out here?

回答1:

^/?$

I think...

回答2:

not exactly sure what your looking for but this matches an empty url strip:

http//\Z

回答3:

The question isn't very clear, but I think you want this:

^http://www.website.com/?$

The ^ and $ match the beginning and end of the string. The /? optionally matches a trailing slash.

来源：https://stackoverflow.com/questions/1473632/what-is-the-regular-expression-to-match-the-empty-string-for-a-rewrite-rule