Is there a method in C# to check if a string is a valid identifier [duplicate]

Answer 1

With Roslyn being open source, code analysis tools are right at your fingertips, and they're written for performance. (Right now they're in pre-release).

However, I can't speak to the performance cost of loading the assembly.

Install the tools using nuget:

Install-Package Microsoft.CodeAnalysis -Pre

Ask your question:

var isValid = Microsoft.CodeAnalysis.CSharp.SyntaxFacts.IsValidIdentifier("I'mNotValid");
Console.WriteLine(isValid);     // False