vb.net REGEX

Hello, all.

I have these two commands

Example insert

{Something here} {{Something else here}}

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Dim Regex2 As Regex = New Regex("\{.*?\}")
Dim Regex4 As Regex = New Regex("\{{.*?\}}")

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They do not produce any errors, however.
The single { }
Will insert into the database for the {{ }}
In the database, you will see

{Something here}

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With the curly brackets around it.

How can I distinguish between the two commands, so that only the double curly's will insert into its column, and the single curly will only insert into its column?

Thanks
Wayne