diff --git a/src/debug_lldb.cc b/src/debug_lldb.cc
index c786eb8..20599e6 100644
--- a/src/debug_lldb.cc
+++ b/src/debug_lldb.cc
@@ -53,55 +53,85 @@ Debug::LLDB::LLDB(): state(lldb::StateType::eStateInvalid), buffer_size(131072)
 #endif
 }
 
-void Debug::LLDB::start(const std::string &command, const boost::filesystem::path &path,
-                  const std::vector<std::pair<boost::filesystem::path, int> > &breakpoints,
-                  std::function<void(int exit_status)> callback,
-                  std::function<void(const std::string &status)> status_callback,
-                  std::function<void(const boost::filesystem::path &file_path, int line_nr, int line_index)> stop_callback,
-                  const std::string &remote_host) {
-  if(!debugger) {
-    lldb::SBDebugger::Initialize();
-    debugger=std::make_unique<lldb::SBDebugger>(lldb::SBDebugger::Create(true, log, nullptr));
-    listener=std::make_unique<lldb::SBListener>("juCi++ lldb listener");
-  }
-  
-  //Create executable string and argument array
+std::tuple<std::vector<std::string>, std::string, std::vector<std::string> > Debug::LLDB::parse_run_arguments(const std::string &command) {
+  std::vector<std::string> environment;
   std::string executable;
   std::vector<std::string> arguments;
+  
   size_t start_pos=std::string::npos;
   bool quote=false;
   bool double_quote=false;
-  bool symbol=false;
+  size_t backslash_count=0;
   for(size_t c=0;c<=command.size();c++) { 
-    if(c==command.size() || (!quote && !double_quote && !symbol && command[c]==' ')) {
+    if(c==command.size() || (!quote && !double_quote && backslash_count%2==0 && command[c]==' ')) {
       if(c>0 && start_pos!=std::string::npos) {
+        auto argument=command.substr(start_pos, c-start_pos);
         if(executable.empty()) {
-          executable=filesystem::unescape_argument(command.substr(start_pos, c-start_pos));
+          //Check for environment variable
+          bool env_arg=false;
+          for(size_t c=0;c<argument.size();++c) {
+            if((argument[c]>='a' && argument[c]<='z') || (argument[c]>='A' && argument[c]<='Z') ||
+               (argument[c]>='0' && argument[c]<='9') || argument[c]=='_')
+              continue;
+            else if(argument[c]=='=' && c+1<argument.size()) {
+              environment.emplace_back(argument.substr(0, c+1)+filesystem::unescape_argument(argument.substr(c+1)));
+              env_arg=true;
+              break;
+            }
+            else
+              break;
+          }
+          
+          if(!env_arg) {
+            executable=filesystem::unescape_argument(argument);
 #ifdef _WIN32
-          if(remote_host.empty())
-            executable+=".exe";
+            if(remote_host.empty())
+              executable+=".exe";
 #endif
+          }
         }
         else
-          arguments.emplace_back(filesystem::unescape_argument(command.substr(start_pos, c-start_pos)));
+          arguments.emplace_back(filesystem::unescape_argument(argument));
         start_pos=std::string::npos;
       }
     }
-    else if(command[c]=='\\' && !quote && !double_quote)
-      symbol=true;
-    else if(symbol)
-      symbol=false;
-    else if(command[c]=='\'' && !double_quote)
+    else if(command[c]=='\'' && backslash_count%2==0 && !double_quote)
       quote=!quote;
-    else if(command[c]=='"' && !quote)
+    else if(command[c]=='"' && backslash_count%2==0 && !quote)
       double_quote=!double_quote;
+    else if(command[c]=='\\' && !quote && !double_quote)
+      ++backslash_count;
+    else
+      backslash_count=0;
     if(c<command.size() && start_pos==std::string::npos && command[c]!=' ')
       start_pos=c;
   }
-  const char *argv[arguments.size()+1];
+  
+  return std::make_tuple(environment, executable, arguments);
+}
+
+void Debug::LLDB::start(const std::string &command, const boost::filesystem::path &path,
+                  const std::vector<std::pair<boost::filesystem::path, int> > &breakpoints,
+                  std::function<void(int exit_status)> callback,
+                  std::function<void(const std::string &status)> status_callback,
+                  std::function<void(const boost::filesystem::path &file_path, int line_nr, int line_index)> stop_callback,
+                  const std::string &remote_host) {
+  if(!debugger) {
+    lldb::SBDebugger::Initialize();
+    debugger=std::make_unique<lldb::SBDebugger>(lldb::SBDebugger::Create(true, log, nullptr));
+    listener=std::make_unique<lldb::SBListener>("juCi++ lldb listener");
+  }
+  
+  //Create executable string and argument array
+  auto parsed_run_arguments=parse_run_arguments(command);
+  auto &environment_from_arguments=std::get<0>(parsed_run_arguments);
+  auto &executable=std::get<1>(parsed_run_arguments);
+  auto &arguments=std::get<2>(parsed_run_arguments);
+  
+  std::vector<const char*> argv;
   for(size_t c=0;c<arguments.size();c++)
-    argv[c]=arguments[c].c_str();
-  argv[arguments.size()]=nullptr;
+    argv.emplace_back(arguments[c].c_str());
+  argv.emplace_back(nullptr);
   
   auto target=debugger->CreateTarget(executable.c_str());
   if(!target.IsValid()) {
@@ -142,14 +172,31 @@ void Debug::LLDB::start(const std::string &command, const boost::filesystem::pat
         }
       }
     }
-    const char *empty_parameter[1];
-    empty_parameter[0]=nullptr;
-    process->RemoteLaunch(argv, empty_parameter, nullptr, nullptr, nullptr, nullptr, lldb::eLaunchFlagNone, false, error);
+    
+    // Create environment array
+    std::vector<const char*> environment;
+    for(auto &e: environment_from_arguments)
+      environment.emplace_back(e.c_str());
+    environment.emplace_back(nullptr);
+    
+    process->RemoteLaunch(argv.data(), environment.data(), nullptr, nullptr, nullptr, nullptr, lldb::eLaunchFlagNone, false, error);
     if(!error.Fail())
       process->Continue();
   }
-  else
-    process = std::make_unique<lldb::SBProcess>(target.Launch(*listener, argv, const_cast<const char**>(environ), nullptr, nullptr, nullptr, path.string().c_str(), lldb::eLaunchFlagNone, false, error));
+  else {
+    // Create environment array
+    std::vector<const char*> environment;
+    for(auto &e: environment_from_arguments)
+      environment.emplace_back(e.c_str());
+    size_t environ_size=0;
+    while(environ[environ_size]!=nullptr)
+      ++environ_size;
+    for(size_t c=0;c<environ_size;++c)
+      environment.emplace_back(environ[c]);
+    environment.emplace_back(nullptr);
+    
+    process = std::make_unique<lldb::SBProcess>(target.Launch(*listener, argv.data(), environment.data(), nullptr, nullptr, nullptr, path.string().c_str(), lldb::eLaunchFlagNone, false, error));
+  }
   if(error.Fail()) {
     Terminal::get().async_print(std::string("Error (debug): ")+error.GetCString()+'\n', true);
     if(callback)
diff --git a/src/debug_lldb.h b/src/debug_lldb.h
index 5c2adfc..8c0b28c 100644
--- a/src/debug_lldb.h
+++ b/src/debug_lldb.h
@@ -8,6 +8,7 @@
 #include <lldb/API/SBProcess.h>
 #include <thread>
 #include <mutex>
+#include <tuple>
 
 namespace Debug {
   class LLDB {
@@ -72,6 +73,8 @@ namespace Debug {
     void write(const std::string &buffer);
     
   private:
+    std::tuple<std::vector<std::string>, std::string, std::vector<std::string>> parse_run_arguments(const std::string &command);
+    
     std::unique_ptr<lldb::SBDebugger> debugger;
     std::unique_ptr<lldb::SBListener> listener;
     std::unique_ptr<lldb::SBProcess> process;
diff --git a/src/filesystem.cc b/src/filesystem.cc
index 8b5f0b8..572ba59 100644
--- a/src/filesystem.cc
+++ b/src/filesystem.cc
@@ -155,21 +155,33 @@ std::string filesystem::unescape_argument(const std::string &argument) {
        (unescaped[0]=='"' && unescaped[unescaped.size()-1]=='"')) {
       char quotation_mark=unescaped[0];
       unescaped=unescaped.substr(1, unescaped.size()-2);
-      for(size_t pos=1;pos<unescaped.size();++pos) {
-        if(unescaped[pos-1]=='\\' && unescaped[pos]==quotation_mark) {
+      size_t backslash_count=0;
+      for(size_t pos=0;pos<unescaped.size();++pos) {
+        if(backslash_count%2==1 && (unescaped[pos]=='\\' || unescaped[pos]==quotation_mark)) {
           unescaped.erase(pos-1, 1);
           --pos;
+          backslash_count=0;
         }
+        else if(unescaped[pos]=='\\')
+          ++backslash_count;
+        else
+          backslash_count=0;
       }
       return unescaped;
     }
   }
   
-  for(size_t pos=1;pos<unescaped.size();++pos) {
-    if(unescaped[pos-1]=='\\' && (unescaped[pos]==' ' || unescaped[pos]=='(' || unescaped[pos]==')' || unescaped[pos]=='\'' || unescaped[pos]=='"')) {
+  size_t backslash_count=0;
+  for(size_t pos=0;pos<unescaped.size();++pos) {
+    if(backslash_count%2==1 && (unescaped[pos]=='\\' || unescaped[pos]==' ' || unescaped[pos]=='(' || unescaped[pos]==')' || unescaped[pos]=='\'' || unescaped[pos]=='"')) {
       unescaped.erase(pos-1, 1);
       --pos;
+      backslash_count=0;
     }
+    else if(unescaped[pos]=='\\')
+      ++backslash_count;
+    else
+      backslash_count=0;
   }
   return unescaped;
 }
diff --git a/src/source_spellcheck.cc b/src/source_spellcheck.cc
index 24e1aac..7844c9f 100644
--- a/src/source_spellcheck.cc
+++ b/src/source_spellcheck.cc
@@ -412,10 +412,10 @@ bool Source::SpellCheckView::is_code_iter(const Gtk::TextIter &iter) {
 
 bool Source::SpellCheckView::is_word_iter(const Gtk::TextIter& iter) {
   auto previous_iter=iter;
-  size_t forward_slash_count=0;
+  size_t backslash_count=0;
   while(previous_iter.backward_char() && *previous_iter=='\\')
-    ++forward_slash_count;
-  if(forward_slash_count%2==1)
+    ++backslash_count;
+  if(backslash_count%2==1)
     return false;
   if(((*iter>='A' && *iter<='Z') || (*iter>='a' && *iter<='z') || *iter>=128))
     return true;
diff --git a/src/window.cc b/src/window.cc
index 8d25f90..a8b74ad 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -1037,7 +1037,7 @@ void Window::set_menu_actions() {
     EntryBox::get().labels.emplace_back();
     auto label_it=EntryBox::get().labels.begin();
     label_it->update=[label_it](int state, const std::string& message){
-      label_it->set_text("Set empty to let juCi++ deduce executable");
+      label_it->set_text("Synopsis: [environment_variable=value]... executable [argument]...\nSet empty to let juCi++ deduce executable.");
     };
     label_it->update(0, "");
     EntryBox::get().entries.emplace_back(run_arguments->second, [this, run_arguments](const std::string& content){
@@ -1134,7 +1134,7 @@ void Window::set_menu_actions() {
     EntryBox::get().labels.emplace_back();
     auto label_it=EntryBox::get().labels.begin();
     label_it->update=[label_it](int state, const std::string& message){
-      label_it->set_text("Set empty to let juCi++ deduce executable");
+      label_it->set_text("Synopsis: [environment_variable=value]... executable [argument]...\nSet empty to let juCi++ deduce executable.");
     };
     label_it->update(0, "");
     EntryBox::get().entries.emplace_back(run_arguments->second, [this, run_arguments](const std::string& content){
diff --git a/tests/filesystem_test.cc b/tests/filesystem_test.cc
index 959c0ef..ffd5cd1 100644
--- a/tests/filesystem_test.cc
+++ b/tests/filesystem_test.cc
@@ -22,6 +22,34 @@ int main() {
     auto unescaped=filesystem::unescape_argument("\"test \\'()\\\"\"");
     g_assert_cmpstr(unescaped.c_str(), ==, "test \\'()\"");
   }
+  {
+    auto unescaped=filesystem::unescape_argument("\\\\");
+    g_assert_cmpstr(unescaped.c_str(), ==, "\\");
+  }
+  {
+    auto unescaped=filesystem::unescape_argument("\\\\\\ ");
+    g_assert_cmpstr(unescaped.c_str(), ==, "\\ ");
+  }
+  {
+    auto unescaped=filesystem::unescape_argument("\\\\\\ \\ \\ \\\\");
+    g_assert_cmpstr(unescaped.c_str(), ==, "\\   \\");
+  }
+  {
+    auto unescaped=filesystem::unescape_argument("c:\\a\\ b\\c");
+    g_assert_cmpstr(unescaped.c_str(), ==, "c:\\a b\\c");
+  }
+  {
+    auto unescaped=filesystem::unescape_argument("\"\\\\\\\"\"");
+    g_assert_cmpstr(unescaped.c_str(), ==, "\\\"");
+  }
+  {
+    auto unescaped=filesystem::unescape_argument("\"\\\"\"");
+    g_assert_cmpstr(unescaped.c_str(), ==, "\"");
+  }
+  {
+    auto unescaped=filesystem::unescape_argument("\"a\\b\"");
+    g_assert_cmpstr(unescaped.c_str(), ==, "a\\b");
+  }
   
   auto tests_path=boost::filesystem::canonical(JUCI_TESTS_PATH);
   {
diff --git a/tests/lldb_test.cc b/tests/lldb_test.cc
index 29ccfbc..01f5871 100644
--- a/tests/lldb_test.cc
+++ b/tests/lldb_test.cc
@@ -13,6 +13,67 @@ int main() {
   auto source_path=tests_path/"lldb_test_files"/"main.cpp";
   g_assert(boost::filesystem::exists(source_path));
   
+  {
+    auto parsed_run_arguments=Debug::LLDB::get().parse_run_arguments("\"~/test/te st\"");
+    assert(std::get<0>(parsed_run_arguments).size()==0);
+    
+    assert(std::get<1>(parsed_run_arguments)=="~/test/te st");
+    
+    assert(std::get<2>(parsed_run_arguments).size()==0);
+  }
+  {
+    auto parsed_run_arguments=Debug::LLDB::get().parse_run_arguments("~/test/te\\ st");
+    assert(std::get<0>(parsed_run_arguments).size()==0);
+    
+    assert(std::get<1>(parsed_run_arguments)=="~/test/te st");
+    
+    assert(std::get<2>(parsed_run_arguments).size()==0);
+  }
+  {
+    auto parsed_run_arguments=Debug::LLDB::get().parse_run_arguments("~/test/te\\ st Arg1\\\\ arg2");
+    assert(std::get<0>(parsed_run_arguments).size()==0);
+    
+    assert(std::get<1>(parsed_run_arguments)=="~/test/te st");
+    
+    assert(std::get<2>(parsed_run_arguments).size()==2);
+    assert(std::get<2>(parsed_run_arguments)[0]=="Arg1\\");
+    assert(std::get<2>(parsed_run_arguments)[1]=="arg2");
+  }
+  {
+    auto parsed_run_arguments=Debug::LLDB::get().parse_run_arguments("~/test/te\\ st Arg1\\\\\\ arg1");
+    assert(std::get<0>(parsed_run_arguments).size()==0);
+    
+    assert(std::get<1>(parsed_run_arguments)=="~/test/te st");
+    
+    assert(std::get<2>(parsed_run_arguments).size()==1);
+    assert(std::get<2>(parsed_run_arguments)[0]=="Arg1\\ arg1");
+  }
+  {
+    auto parsed_run_arguments=Debug::LLDB::get().parse_run_arguments("\"~/test/te st\" Arg1 \"Ar g2\" Ar\\ g3");
+    assert(std::get<0>(parsed_run_arguments).size()==0);
+    
+    assert(std::get<1>(parsed_run_arguments)=="~/test/te st");
+    
+    assert(std::get<2>(parsed_run_arguments).size()==3);
+    assert(std::get<2>(parsed_run_arguments)[0]=="Arg1");
+    assert(std::get<2>(parsed_run_arguments)[1]=="Ar g2");
+    assert(std::get<2>(parsed_run_arguments)[2]=="Ar g3");
+  }
+  {
+    auto parsed_run_arguments=Debug::LLDB::get().parse_run_arguments("ENV1=Test ENV2=Te\\ st ENV3=\"te ts\" ~/test/te\\ st Arg1 \"Ar g2\" Ar\\ g3");
+    assert(std::get<0>(parsed_run_arguments).size()==3);
+    assert(std::get<0>(parsed_run_arguments)[0]=="ENV1=Test");
+    assert(std::get<0>(parsed_run_arguments)[1]=="ENV2=Te st");
+    assert(std::get<0>(parsed_run_arguments)[2]=="ENV3=te ts");
+    
+    assert(std::get<1>(parsed_run_arguments)=="~/test/te st");
+    
+    assert(std::get<2>(parsed_run_arguments).size()==3);
+    assert(std::get<2>(parsed_run_arguments)[0]=="Arg1");
+    assert(std::get<2>(parsed_run_arguments)[1]=="Ar g2");
+    assert(std::get<2>(parsed_run_arguments)[2]=="Ar g3");
+  }
+  
   std::vector<std::pair<boost::filesystem::path, int> > breakpoints;
   breakpoints.emplace_back(source_path, 2);