How do I... Extract variable names from string with Regex

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C#

Hi everybody! I want to read variables names from a given string with regex.

For example,

Hi {$name}, you have {$days} days left.

The string is shown to user in a textbox so that he will know where values will be inserted after giving command for execution. How do I extract the variables names: (name, days) from the string using regex or any other method? I'm programming in C#.

Thanks in advance.