diff --git a/ChangeLog b/ChangeLog
index 692e1c38..db2b1b99 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,6 +13,23 @@
 ################################################################################  
 ################################################################################
 
+################################################################################
+### version 3.1.3
+################################################################################  
+
+# IntaRNA
+- bugfix latest changes on traceback
+
+################################################################################  
+
+191104 Martin Raden
+ * PredictorMfe2dSeedExtension::
+   * traceBack() 
+     * bugfix tracback (reset of k2 iteration)
+
+191031 Martin Raden
+ * using c++11 raw strings where appropriate
+
 ################################################################################
 ### version 3.1.2
 ################################################################################  
@@ -27,6 +44,7 @@
   - new total energy output `Etotal` = (E+Eall1+Eall2) and 
     `EallTotal` = (Eall+Eall1+Eall2)
   - new `RT` output
+  - new `bpList` output
 
 # auxiliary R scripts
 - plotRegions.py - visualization of sequence regions covered by IntaRNA 
diff --git a/configure.ac b/configure.ac
index 44fe1fcf..7d2cbd24 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 
 AC_PREREQ([2.65])
 # 5 argument version only available with aclocal >= 2.64
-AC_INIT([IntaRNA], [3.1.2], [], [intaRNA], [http://www.bioinf.uni-freiburg.de] )
+AC_INIT([IntaRNA], [3.1.3], [], [intaRNA], [http://www.bioinf.uni-freiburg.de] )
 
 # minimal required version of the boost library 
 BOOST_REQUIRED_VERSION=1.50.0
diff --git a/src/IntaRNA/AccessibilityConstraint.cpp b/src/IntaRNA/AccessibilityConstraint.cpp
index 382b9e88..07f1e320 100644
--- a/src/IntaRNA/AccessibilityConstraint.cpp
+++ b/src/IntaRNA/AccessibilityConstraint.cpp
@@ -26,8 +26,7 @@ const std::string AccessibilityConstraint::dotBracketAlphabet =
 					;
 const std::string AccessibilityConstraint::regionIndexList =
 					"["+AccessibilityConstraint::dotBracket_constraints+"]:"
-					+"(-?[123456789]\\d*--?[123456789]\\d*,)*-?[123456789]\\d*--?[123456789]\\d*"
-					;
+					+ R"((-?[123456789]\d*--?[123456789]\d*,)*-?[123456789]\d*--?[123456789]\d*)";
 
 const boost::regex AccessibilityConstraint::regex(
 					"(["
@@ -41,14 +40,14 @@ const boost::regex AccessibilityConstraint::regex(
 // D | Dm1.9 | Db-0.7 | Dm1.9b-0.7
 // Z | Zb0.8
 // W
-const boost::regex AccessibilityConstraint::regexShapeMethod("^((D(m-?(\\d+|\\d+.\\d+))?(b-?(\\d+|\\d+.\\d+))?)|(Z(b(\\d+|\\d+.\\d+))?)|(W))$");
+const boost::regex AccessibilityConstraint::regexShapeMethod(R"(^((D(m-?(\d+|\d+.\d+))?(b-?(\d+|\d+.\d+))?)|(Z(b(\d+|\d+.\d+))?)|(W))$)");
 
 // M
 // C0.2
 // S
 // Ls0.5i0.5
 // Os0.5i-0.5
-const boost::regex AccessibilityConstraint::regexShapeConversion("^((M)|(C(\\d+|\\d+.\\d+)?)|(S)|((L|O)(s-?(\\d+|\\d+.\\d+)i-?(\\d+|\\d+.\\d+))?))$");
+const boost::regex AccessibilityConstraint::regexShapeConversion(R"(^((M)|(C(\d+|\d+.\d+)?)|(S)|((L|O)(s-?(\d+|\d+.\d+)i-?(\d+|\d+.\d+))?))$)");
 
 
 ////////////////////////////////////////////////////////////////////////
diff --git a/src/IntaRNA/AccessibilityFromStream.cpp b/src/IntaRNA/AccessibilityFromStream.cpp
index 1abbcd1b..86eff91f 100644
--- a/src/IntaRNA/AccessibilityFromStream.cpp
+++ b/src/IntaRNA/AccessibilityFromStream.cpp
@@ -73,7 +73,7 @@ parseRNAplfold_text( std::istream & inStream, const Z_type RT, const bool parseP
 	if ( !std::getline( inStream, line ) ) {
 		throw std::runtime_error("AccessibilityFromStream::parseRNAplfold_text() : nothing readable");
 	}
-	if ( ! boost::regex_match(line,boost::regex("^#[\\w\\s]+$"), boost::match_perl) ) {
+	if ( ! boost::regex_match(line,boost::regex(R"(^#[\w\s]+$)"), boost::match_perl) ) {
 		throw std::runtime_error("AccessibilityFromStream::parseRNAplfold_text() : first line != expected header line starting with '#'");
 	}
 
@@ -81,7 +81,7 @@ parseRNAplfold_text( std::istream & inStream, const Z_type RT, const bool parseP
 	if ( !std::getline( inStream, line ) ) {
 		throw std::runtime_error("AccessibilityFromStream::parseRNAplfold_text() : length header (2nd line) not found");
 	}
-	if ( ! boost::regex_match(line,boost::regex("^\\s*#i.\\s+l=1(\\s+\\d+)*\\s*$"), boost::match_perl) ) {
+	if ( ! boost::regex_match(line,boost::regex(R"(^\s*#i.\s+l=1(\s+\d+)*\s*$)"), boost::match_perl) ) {
 		throw std::runtime_error("AccessibilityFromStream::parseRNAplfold_text() : second line is no proper lengths header");
 	}
 	// check if maxLength <= max available length
diff --git a/src/IntaRNA/IndexRange.cpp b/src/IntaRNA/IndexRange.cpp
index fb9a42da..264f9d7a 100644
--- a/src/IntaRNA/IndexRange.cpp
+++ b/src/IntaRNA/IndexRange.cpp
@@ -15,7 +15,6 @@ const size_t IndexRange::LAST_INDEX = IndexRange::NA_INDEX-1;
 
 ////////////////////////////////////////////////////////////////
 
-//const std::string IndexRange::regexString("(0|-?[123456789]\\d*)-(0|-?[123456789]\\d*)");
 const boost::regex IndexRange::regex("^"+std::string(IndexRange::regexString)+"$");
 
 ////////////////////////////////////////////////////////////////
diff --git a/src/IntaRNA/IndexRange.h b/src/IntaRNA/IndexRange.h
index 8079980f..c5258b4e 100644
--- a/src/IntaRNA/IndexRange.h
+++ b/src/IntaRNA/IndexRange.h
@@ -35,7 +35,7 @@ class IndexRange {
 	size_t to;
 
 	//! regular expression that matches valid IndexRange string encodings
-	static constexpr const char* regexString = "(0|-?[123456789]\\d*)-(0|-?[123456789]\\d*)";
+	static constexpr const char* regexString = R"((0|-?[123456789]\d*)-(0|-?[123456789]\d*))";
 
 	//! regular expression that matches valid IndexRange string encodings
 	static const boost::regex regex;
diff --git a/src/IntaRNA/PredictionTrackerSpotProb.cpp b/src/IntaRNA/PredictionTrackerSpotProb.cpp
index 0d09a7e5..1aaeb0c2 100644
--- a/src/IntaRNA/PredictionTrackerSpotProb.cpp
+++ b/src/IntaRNA/PredictionTrackerSpotProb.cpp
@@ -8,8 +8,8 @@ namespace IntaRNA {
 
 //////////////////////////////////////////////////////////////////////
 
-const std::string PredictionTrackerSpotProb::str_spot ="(0|-?[123456789]\\d*)&(0|-?[123456789]\\d*)";
-const boost::regex PredictionTrackerSpotProb::regexSpotString("\\s*|"+str_spot+"(,"+str_spot+")*");
+const std::string PredictionTrackerSpotProb::str_spot = R"((0|-?[123456789]\d*)&(0|-?[123456789]\d*))";
+const boost::regex PredictionTrackerSpotProb::regexSpotString(R"(\s*|)"+str_spot+"(,"+str_spot+")*");
 
 //////////////////////////////////////////////////////////////////////
 
diff --git a/src/IntaRNA/PredictorMfe2dSeedExtension.cpp b/src/IntaRNA/PredictorMfe2dSeedExtension.cpp
index 3d2e5d75..b98278ee 100644
--- a/src/IntaRNA/PredictorMfe2dSeedExtension.cpp
+++ b/src/IntaRNA/PredictorMfe2dSeedExtension.cpp
@@ -392,8 +392,8 @@ traceBack( Interaction & interaction )
 						// check all combinations of decompositions into (i1,i2)..(k1,k2)-(si1,si2)
 						const size_t k1max = std::min(si1-1,i1+noLpShift+energy.getMaxInternalLoopSize1()+1);
 						const size_t k2max = std::min(si2-1,i2+noLpShift+energy.getMaxInternalLoopSize2()+1);
-						for (k1++; traceNotFound && k1<=k1max; k1++) {
-						for (k2++; traceNotFound && k2<=k2max; k2++) {
+						for (k1=i1+noLpShift+1; traceNotFound && k1<=k1max; k1++) {
+						for (k2=i2+noLpShift+1; traceNotFound && k2<=k2max; k2++) {
 							// check if (k1,k2) are valid left boundary
 							if ( E_isNotINF( hybridE_left(si1-k1,si2-k2) ) ) {
 								if ( E_equal( curE,
@@ -411,10 +411,10 @@ traceBack( Interaction & interaction )
 									i1=k1;
 									i2=k2;
 									curE = hybridE_left(si1-i1,si2-i2);
-								}
-							}
-						}
-						}
+								} // found trace step
+							} // (k1,k2) complementary
+						} // k2
+						} // k1
 						if (traceNotFound) {
 							LOG(ERROR) <<"left-not-found:  i "<<i1<<","<<i2<<"  si "<<si1<<","<<si2;
 							throw std::runtime_error("trace not found");
diff --git a/src/IntaRNA/SeedHandlerExplicit.cpp b/src/IntaRNA/SeedHandlerExplicit.cpp
index 98e0f700..eec4d52b 100644
--- a/src/IntaRNA/SeedHandlerExplicit.cpp
+++ b/src/IntaRNA/SeedHandlerExplicit.cpp
@@ -111,7 +111,7 @@ checkSeedEncoding( const std::string & seed )
 	}
 
 	// check general encoding
-	if ( ! boost::regex_match(seed,boost::regex("^-?\\d+[|\\.]+&-?\\d+[|\\.]+$"), boost::match_perl) ) {
+	if ( ! boost::regex_match(seed,boost::regex(R"(^-?\d+[|\.]+&-?\d+[|\.]+$)"), boost::match_perl) ) {
 		return "is not of regular expression format start1dotbar1&start2dotbar2, e.g. '3|||.|&6||.||'";
 	}
 
diff --git a/src/IntaRNA/general.cpp b/src/IntaRNA/general.cpp
index f53b151c..b036c785 100644
--- a/src/IntaRNA/general.cpp
+++ b/src/IntaRNA/general.cpp
@@ -17,7 +17,7 @@ std::ostream *
 newOutputStream( const std::string & out )
 {
 	// check if empty or whitespace string
-	if (boost::regex_match( out, boost::regex("^\\s*$"), boost::match_perl)) {
+	if (boost::regex_match( out, boost::regex(R"(^\s*$)"), boost::match_perl)) {
 		return NULL;
 	}
 	// open according stream
@@ -87,7 +87,7 @@ std::istream *
 newInputStream( const std::string & in )
 {
 	// check if empty or whitespace string
-	if (boost::regex_match( in, boost::regex("^\\s*$"), boost::match_perl)) {
+	if (boost::regex_match( in, boost::regex(R"(^\s*$)"), boost::match_perl)) {
 		return NULL;
 	}
 	// open according stream
diff --git a/src/bin/CommandLineParsing.cpp b/src/bin/CommandLineParsing.cpp
index fd37c11c..e853d06f 100644
--- a/src/bin/CommandLineParsing.cpp
+++ b/src/bin/CommandLineParsing.cpp
@@ -6,6 +6,7 @@
 #include <cmath>
 #include <stdexcept>
 #include <fstream>
+#include <cstdio>
 
 #if INTARNA_MULITHREADING
 	#include <omp.h>
@@ -1099,6 +1100,11 @@ parse(int argc, char** argv)
 	if (parsingCode == ReturnCode::KEEP_GOING) {
 		try {
 
+
+			// parsing escape literals
+			outSep = unescaped_string<std::string::const_iterator>::getUnescaped( outSep );
+
+
 			// open output stream
 			{
 				// open according stream
@@ -2511,7 +2517,7 @@ getPersonality( int argc, char ** argv )
 	// default : check via call name
 	std::string value(argv[0]);
 	// strip path if present
-	size_t cutPos = value.find_last_of("/\\");
+	size_t cutPos = value.find_last_of(R"(/\)");
 	if (cutPos != std::string::npos) {
 		value = value.substr(cutPos+1);
 	}
@@ -2519,7 +2525,7 @@ getPersonality( int argc, char ** argv )
 	// check if respective parameter provided
 	// --> overwrites default from call name
 	const boost::regex paramNameRegex("^--personality.*", boost::regex::icase);
-	const boost::regex paramRegex("^--personality=\\S+$", boost::regex::icase);
+	const boost::regex paramRegex(R"(^--personality=\S+$)", boost::regex::icase);
 	bool setViaParameter = false;
 	for (int i=1; i<argc; i++) {
 		std::string argi(argv[i]);
diff --git a/src/bin/CommandLineParsing.h b/src/bin/CommandLineParsing.h
index cea60b04..4a3f5520 100644
--- a/src/bin/CommandLineParsing.h
+++ b/src/bin/CommandLineParsing.h
@@ -9,6 +9,7 @@
 #include <boost/program_options.hpp>
 #include <boost/algorithm/string.hpp>
 #include <boost/filesystem.hpp>
+#include <boost/spirit/include/qi.hpp>
 
 #include <iostream>
 #include <cstdarg>
@@ -87,6 +88,41 @@ class CommandLineParsing {
 		}
 	}
 
+	template <typename InputIterator = std::string::const_iterator>
+	struct unescaped_string
+			: boost::spirit::qi::grammar<InputIterator, std::string(char const*)>
+			{
+				boost::spirit::qi::rule<InputIterator, std::string(char const*)> unesc_str;
+				boost::spirit::qi::symbols<char const, char const> unesc_char;
+
+				unescaped_string()
+	    		  : unescaped_string::base_type(unesc_str)
+				{
+					using namespace boost::spirit;
+					unesc_char.add(R"(\a)", '\a')(R"(\b)", '\b')(R"(\f)", '\f')(R"(\n)", '\n')
+	                    		  (R"(\r)", '\r')(R"(\t)", '\t')(R"(\v)", '\v')
+	                    		  (R"(\\)", '\\')(R"(\')", '\'')(R"(\")", '\"')
+	                    		  ;
+
+					unesc_str = qi::lit(qi::_r1)
+								>> *(unesc_char | qi::graph | qi::space | R"(\x)" >> qi::hex)
+								>>  qi::lit(qi::_r1)
+								;
+				}
+
+				static
+				std::string
+				getUnescaped( const std::string & rawString )
+				{
+					using namespace boost::spirit;
+					std::string parsed;
+					char const* quote = ""; // leading and trailing quote string to parse
+					unescaped_string myGrammar;
+					qi::parse( rawString.begin(), rawString.end(), myGrammar(quote), parsed);
+					return parsed;
+				}
+			};
+
 	/**
 	 * Identifies the requested personality from the given call arguments
 	 */
diff --git a/tests/AccessibilityConstraint_test.cpp b/tests/AccessibilityConstraint_test.cpp
index e1ef03ae..776909b6 100644
--- a/tests/AccessibilityConstraint_test.cpp
+++ b/tests/AccessibilityConstraint_test.cpp
@@ -28,7 +28,7 @@ TEST_CASE( "AccessibilityConstraint", "[AccessibilityConstraint]" ) {
 		boost::regex regex;
 
 		// general test
-		regex = boost::regex("\\s");
+		regex = boost::regex(R"(\s)");
 		REQUIRE_FALSE(boost::regex_match( "", regex, boost::match_perl ));
 		REQUIRE(boost::regex_match( " ", regex, boost::match_perl ));
 
diff --git a/tests/PredictionTrackerProfileMinE_test.cpp b/tests/PredictionTrackerProfileMinE_test.cpp
index 5e4676fa..c7a5ef38 100644
--- a/tests/PredictionTrackerProfileMinE_test.cpp
+++ b/tests/PredictionTrackerProfileMinE_test.cpp
@@ -39,8 +39,8 @@ TEST_CASE( "PredictionTrackerProfileMinE", "[PredictionTrackerProfileMinE]" ) {
 //		LOG(DEBUG)<<"1.s2:\n"<<s2out.str();
 
 		// check output
-		REQUIRE( boost::regex_match(s1out.str(),boost::regex("^idx;"+r1.getId()+";minE(\\s+\\d;\\w;X){"+toString(r1.size())+"}\\s*$"), boost::match_perl) );
-		REQUIRE( boost::regex_match(s2out.str(),boost::regex("^idx;"+r2.getId()+";minE(\\s+\\d;\\w;X){"+toString(r2.size())+"}\\s*$"), boost::match_perl) );
+		REQUIRE( boost::regex_match(s1out.str(),boost::regex("^idx;"+r1.getId()+R"(;minE(\s+\d;\w;X){)"+toString(r1.size())+R"(}\s*$)"), boost::match_perl) );
+		REQUIRE( boost::regex_match(s2out.str(),boost::regex("^idx;"+r2.getId()+R"(;minE(\s+\d;\w;X){)"+toString(r2.size())+R"(}\s*$)"), boost::match_perl) );
 	}
 
 	SECTION("single range") {
@@ -58,8 +58,8 @@ TEST_CASE( "PredictionTrackerProfileMinE", "[PredictionTrackerProfileMinE]" ) {
 //		LOG(DEBUG)<<"2.s2:\n"<<s2out.str();
 
 		// check output
-		REQUIRE( boost::regex_match(s1out.str(),boost::regex("^idx;"+r1.getId()+";minE(\\s+\\d;\\w;0\\.02){2}(\\s+\\d;\\w;X){"+toString(r1.size()-2)+"}\\s*$"), boost::match_perl) );
-		REQUIRE( boost::regex_match(s2out.str(),boost::regex("^idx;"+r2.getId()+";minE(\\s+\\d;\\w;X){"+toString(r2.size()-2-4)+"}(\\s+\\d;\\w;0\\.02){2}(\\s+\\d;\\w;X){4}\\s*$"), boost::match_perl) );
+		REQUIRE( boost::regex_match(s1out.str(),boost::regex("^idx;"+r1.getId()+R"(;minE(\s+\d;\w;0\.02){2}(\s+\d;\w;X){)"+toString(r1.size()-2)+R"(}\s*$)"), boost::match_perl) );
+		REQUIRE( boost::regex_match(s2out.str(),boost::regex("^idx;"+r2.getId()+R"(;minE(\s+\d;\w;X){)"+toString(r2.size()-2-4)+R"(}(\s+\d;\w;0\.02){2}(\s+\d;\w;X){4}\s*$)"), boost::match_perl) );
 	}
 
 
@@ -79,8 +79,8 @@ TEST_CASE( "PredictionTrackerProfileMinE", "[PredictionTrackerProfileMinE]" ) {
 //		LOG(DEBUG)<<"3.s2:\n"<<s2out.str();
 
 		// check output
-		REQUIRE( boost::regex_match(s1out.str(),boost::regex("^idx;"+r1.getId()+";minE(\\s+\\d;\\w;0\\.02)(\\s+\\d;\\w;0\\.01){2}(\\s+\\d;\\w;X){"+toString(r1.size()-3)+"}\\s*$"), boost::match_perl) );
-		REQUIRE( boost::regex_match(s2out.str(),boost::regex("^idx;"+r2.getId()+";minE(\\s+\\d;\\w;X){"+toString(r2.size()-3-4)+"}(\\s+\\d;\\w;0\\.01){2}(\\s+\\d;\\w;0\\.02)(\\s+\\d;\\w;X){4}\\s*$"), boost::match_perl) );
+		REQUIRE( boost::regex_match(s1out.str(),boost::regex("^idx;"+r1.getId()+R"(;minE(\s+\d;\w;0\.02)(\s+\d;\w;0\.01){2}(\s+\d;\w;X){)"+toString(r1.size()-3)+R"(}\s*$)"), boost::match_perl) );
+		REQUIRE( boost::regex_match(s2out.str(),boost::regex("^idx;"+r2.getId()+R"(;minE(\s+\d;\w;X){)"+toString(r2.size()-3-4)+R"(}(\s+\d;\w;0\.01){2}(\s+\d;\w;0\.02)(\s+\d;\w;X){4}\s*$)"), boost::match_perl) );
 	}