Regex remove last part

Question

If I have this:

2.2.3.140113

and do this:

$([System.Text.RegularExpressions.Regex]::Replace( $(str), '^(\d+)\.(.+)$', '$1_$2' ) )">

I will get this:

2_2.3.140113

What I want is that it should be

2_2.3

How do I remove the last part?

Answer 1

Change your regex to:

^(\d+)\.(.+)\.\d+$