Regex.Match() vs new Regex().Match() is there a difference?

Question

Specifically to memory here, would Regex.Match() and new Regex().Match() have a difference?

Would not creating a new assertion of the Regex class cost more memory then using Regex.Match?

The reason I am asking is I've always been doing new Regex("pattern").Match("Input") and saw Regex.Match and I'm now questioning if I'm doing it wrong!

Answer 1

With that exact syntax, for you as the developer, there is no difference. except that new Regex() is not a public constructor, you have to pass a pattern.

So in that case the Static probably better.

Where you would you new Regex() is, to assign it to an instance of a Regex like:

var myregex = new Regex("my pattern");

You can then check things on the instance like timeout MatchTimeout and Options.