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I want to create regular expression for {SID} , {MetD}, {car} which should include curly brackets as well.

What I have tried:

Regex r = new Regex(@"^{[A-Za-z]}$");

the above regular expression is not working.
Updated 7-Aug-22 19:24pm

Your regex specifies:
^              Start of line
{              A literal '{'
[A-Za-z]       Any single upper or lower case letter.
}              A literal '}'
$              End of line

You need to add a "multiple times" indicator to that: '*' (zero or more) or '+' (one or more).

If you are going to work with Regexes, then get a copy of Expresso[^] - it's free, and it examines, tests, and generates Regular expressions.
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the above regular expression is not working.

Try something like
Regex r = new Regex(@"^{[A-Za-z]+}$");

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre -[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx: Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
This site also show the Regex in a nice graph but can't test what match the RegEx: Regexper[^]
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