Regex problem

[2ni]

i want to replace some text using regular expression but it doesn't work :

here is my text (some TSQL)
CREATE PROCEDURE [dbo].[DELETE_FILE]
(@FILE varchar(255))
AS

--Comment

exec master..xp_deletefile @FILE


/*
maxi comment
*/
GO

I want to delete blank lines and comments

Dim re As Regex

InputCode = re.Replace(InputCode, "^\s*\-{2,}.*$", String.Empty, RegexOptions.Multiline)

InputCode = re.Replace(InputCode, "^\s*\-{2,}.*$", String.Empty, RegexOptions.Multiline)

InputCode = re.Replace(InputCode, "/\*[.\n]*\*/", String.Empty, RegexOptions.Singleline)

the second replacement works but the other not. I tried my expression in a regex tester and they matches ! Someone can help me ??