Thanks for that site; I'll actually probably use that a lot now =P

I set up a simple test to compare that site to Vb.net:

Regex: "^[a-z]*$"

Text:
"testone
testtwo
testthree"

Options: Multiline

The site returned three matches:
(0) testone
(1) testtwo
(2) testthree

Vb.net returned one match:
(0) testthree