using uCalcSoftware; var uc = new uCalc(); // In example we'll define quoted text using < and > as // surrounding quotes. Singe and double quotes ' and " // are already defined by default. This is just an example. // Quoted text must be defined as TokenType.Literal // The last argument, 1, means that the literal part of the match will // be the part of the regex found int the first parenthesis (here's // there's only one set of parenthesis). var t = uc.NewTransformer(); var SpecialQuotes = t.Tokens.Add("<([^>]*)>", TokenType.Literal, "", 1); SpecialQuotes.SetDataType(BuiltInType.String); SpecialQuotes.IsProperty(ItemIs.QuotedText, true); t.Pattern("{token:1}"); Console.WriteLine(t.Filter("abc xyz 123.456 + 25e2").Matches.Text); Console.WriteLine(""); // Based on the definition, the part within < and > is the literal part // passed to the string + operator used by EvalStr uc.ExpressionTokens.Add(SpecialQuotes); Console.WriteLine(uc.EvalStr(" + < plus more>"));