clr sql server function

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This is my function:

<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function RegExMatch(ByVal pattern As String, _
ByVal matchString As String) As Boolean

Dim r1 As Regex = New Regex(pattern.TrimEnd(Nothing),
RegexOptions.Compiled)
Return r1.Match(matchString).Success
End Function


I have noticed that the call:

select dbo.RegexMatch('some_reg_exp_pattern', my_match_content)

will trim my_match_content to 4000 chars.
It means everything over 4000 chars will be ignored. I guess this is
happening because of mapping string to a varchar - which may have a
max 4000 chars.

And my_match_content is actually a column varchar(max).

How can I adapt the function to support biger size strings?
Thanks,
xke

.

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