// @nuget: Sprache -version 2.3.1

//https://stackoverflow.com/questions/51231883/sprache-cannot-recognise-this-sequence/70297981

using Sprache;

using System;

using System.Linq;

using System.Collections.Generic;

public partial class Program

{

    public static void Main()

    {         

            var text = @"

    Entity

{

  propertyA simple

  propertyB 10-1

  propertyC ""first""

  propertyD ""I am a line that spawns \

  to another line""

  propertyE ""second""

  propertyF 1,2,3,4,5,6,\

    7,8,9,10,11,\

    12,13,14

  propertyG ""one"",""two"",""three"",\

  ""four"",""five"",""six"",""seven"",\

  ""eight"",""nine""

}

".Trim()    ;

            var result=  RemoveSlash(text).ToList();

​

            foreach (var l in result)

                Console.WriteLine(l);

​

        }

     static   IEnumerable<string> RemoveSlash(string text)

        {

            // return;

            Parser<string> Eol = Parse.String("\\" + Environment.NewLine).Text();

​

            var oneLine = Parse.AnyChar.Until(Parse.LineEnd).Text();

            var multiLine =

                from l in Parse.AnyChar.Until(Eol).Text().Many()  //multiline

                from c in oneLine.Once()    //single line

                let m = string.Join("", l.Concat(c))  //join multilines

                select m;

​

            var lines = multiLine.Or(oneLine);

            var result = lines.Many().Parse(text);

            return result;

​

        }

}