Many regex helpers

Regex.cs

var content = "{ \"name\": \"Leandro Grando\" }";

// Remove all spaces and new lines from object
var spacelessContent = Regex.Replace(content, @"\s+", string.Empty);

// Minify json string
var minifiedJson = Regex.Replace(content, "(\"(?:[^\"\\\\]|\\\\.)*\")|\\s+", "$1");

// Negate regex - not tested in c#
var negated = ^((?!gmail.com).)*$

// Between last "." and ".exe".
var between = Regex.Match(Assembly.GetExecutingAssembly().ManifestModule.Name, @"(?<=\.)(\w+?)(?=\.exe$)").Value;