FIX: Allow escaping of backslash

src/dotenv.net/Parser.cs

@@ -11,7 +11,7 @@ internal static class Parser
     private const string DoubleQuotes = "\"";
 
     private static readonly Regex IsQuotedLineStart = new("^[a-zA-Z0-9_ .-]+=\\s*\".*$", RegexOptions.Compiled);
-    private static readonly Regex IsQuotedLineEnd = new("(?<!\\\\)\"\\s*$", RegexOptions.Compiled);
+    private static readonly Regex IsQuotedLineEnd = new(@"(?<!\\)(?:(?<=^|[^\\])(\\\\)*|^)\s*""\s*$", RegexOptions.Compiled);
 
     internal static ReadOnlySpan<KeyValuePair<string, string>> Parse(ReadOnlySpan<string> rawEnvRows,
         bool trimValues)
@@ -86,6 +86,7 @@ private static string StripQuotes(this string value)
             modified = true;
         }
 
+        trimmed = trimmed.Replace(@"\\", @"\").Replace("\\\"", "\"");;
 
         return modified ? trimmed : value;
     }

src/dotenv.net/dotenv.net.csproj

@@ -12,12 +12,12 @@
     <RepositoryUrl>https://github.com/bolorundurowb/dotenv.net</RepositoryUrl>
     <LangVersion>default</LangVersion>
     <PackageReadmeFile>README.md</PackageReadmeFile>
-    <PackageVersion>3.2.1</PackageVersion>
+    <PackageVersion>3.3.0</PackageVersion>
     <RepositoryType>git</RepositoryType>
     <PackageTags>dotnet, environment, variables, env, dotenv, net core, autofac</PackageTags>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <AssemblyVersion>3.2.1</AssemblyVersion>
-    <FileVersion>3.2.1</FileVersion>
+    <AssemblyVersion>3.3.0</AssemblyVersion>
+    <FileVersion>3.3.0</FileVersion>
     <NeutralLanguage>en-NG</NeutralLanguage>
     <TargetFrameworks>netstandard1.6;netstandard2.0;netstandard2.1</TargetFrameworks>
     <Title>dotenv.net</Title>

tests/dotenv.net.Tests/DotEnv.Fluent.Tests.cs

@@ -16,6 +16,7 @@ public class DotEnvFluentTests
     private const string AsciiEnvFileName = "ascii.env";
     private const string GenericEnvFileName = "generic.env";
     private const string IncompleteEnvFileName = "incomplete.env";
+    private const string EscapedCharactersEnvFileName = "escape.env";
 
     [Fact]
     public void ConfigShouldThrowWithNonExistentEnvAndTrackedExceptions()
@@ -139,6 +140,9 @@ public void ConfigLoadsMultilineEnvs()
         EnvReader.GetStringValue("DOUBLE_QUOTE")
             .Should()
             .Be("double");
+        EnvReader.GetStringValue("DOUBLE_QUOTE_EQUALS2")
+            .Should()
+            .Be("double=2");
         EnvReader.GetStringValue("DOUBLE_QUOTE_MULTI_LINE")
             .Should()
             .Be($"dou{Environment.NewLine}bler");
@@ -168,4 +172,29 @@ public void ConfigShouldLoadEnvWithInvalidEnvEntries()
             .Should()
             .BeFalse();
     }
+
+        [Fact]
+        public void ConfigLoadsEnvWithEscapedCharacters()
+        {
+            DotEnv.Fluent()
+                .WithEnvFiles(EscapedCharactersEnvFileName)
+                .WithoutTrimValues()
+                .Load();
+
+            EnvReader.GetStringValue("unescaped")
+                     .Should()
+                     .Be("unescaped Value\\");
+
+            EnvReader.GetStringValue("more_escaped")
+                     .Should()
+                     .Be("more escaped Value\\\\");
+
+            EnvReader.GetStringValue("escaped")
+                     .Should()
+                     .Be($"escaped Value\"{Environment.NewLine}secondLine");
+
+            EnvReader.GetStringValue("escape_in_the_middle")
+                     .Should()
+                     .Be("this time we \" escaped in the middle");
+        }
 }

tests/dotenv.net.Tests/dotenv.net.Tests.csproj

@@ -29,6 +29,9 @@
     <None Update="ascii.env">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Update="escape.env">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
     <None Update="generic.env">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>

tests/dotenv.net.Tests/escape.env

@@ -0,0 +1,6 @@
+unescaped="unescaped Value\\"
+more_escaped="more escaped Value\\\\"
+escaped="escaped Value\"
+secondLine"
+irrelevantValue=""
+escape_in_the_middle="this time we \" escaped in the middle"

tests/dotenv.net.Tests/multi-lines.env

@@ -1,4 +1,5 @@
 DOUBLE_QUOTE="double"
+DOUBLE_QUOTE_EQUALS2="double=2"
 DOUBLE_QUOTE_MULTI_LINE="dou
 bler"
 DOUBLE_QUOTE_EVEN_MORE_LINES="dou