diff --git a/src/script/context.cpp b/src/script/context.cpp
index 82ef9a96..3b59c6a7 100644
--- a/src/script/context.cpp
+++ b/src/script/context.cpp
@@ -74,7 +74,7 @@ ScriptValueP Context::eval(const Script& script, bool useScope) {
 				// Get a variable
 				case I_GET_VAR: {
 					ScriptValueP value = variables[i.data].value;
-					if (!value) throw ScriptError(_("Variable not set: ") + variable_to_string((Variable)i.data));
+					if (!value) throw ScriptErrorNoVariable(variable_to_string((Variable)i.data));
 					stack.push_back(value);
 					break;
 				}
@@ -124,7 +124,7 @@ ScriptValueP Context::eval(const Script& script, bool useScope) {
 				// Function call
 				case I_CALL: {
 					// new scope
-					size_t scope = openScope();
+					LocalScope local_scope(*this);
 					// prepare arguments
 					for (unsigned int j = 0 ; j < i.data ; ++j) {
 						setVariable((Variable)instr[i.data - j - 1].data, stack.back());
@@ -135,7 +135,6 @@ ScriptValueP Context::eval(const Script& script, bool useScope) {
 						// get function and call
 						stack.back() = stack.back()->eval(*this);
 					} catch (const Error& e) {
-						closeScope(scope);
 						// try to determine what named function was called
 						// the instructions for this look like:
 						//   I_GET_VAR   name of function
@@ -152,8 +151,6 @@ ScriptValueP Context::eval(const Script& script, bool useScope) {
 							throw e; // rethrow
 						}
 					}
-					// restore scope
-					closeScope(scope);
 					break;
 				}
 				
@@ -241,7 +238,7 @@ void Context::setVariable(Variable name, const ScriptValueP& value) {
 
 ScriptValueP Context::getVariable(const String& name) {
 	ScriptValueP value = variables[string_to_variable(name)].value;
-	if (!value) throw ScriptError(_("Variable not set: ") + name);
+	if (!value) throw ScriptErrorNoVariable(name);
 	return value;
 }
 
@@ -250,7 +247,7 @@ ScriptValueP Context::getVariableOpt(const String& name) {
 }
 ScriptValueP Context::getVariable(Variable var) {
 	if (variables[var].value) return variables[var].value;
-	throw ScriptError(_("Variable not set: ") + variable_to_string(var));
+	throw ScriptErrorNoVariable(variable_to_string(var));
 }
 ScriptValueP Context::getVariableInScopeOpt(Variable var) {
 	if (variables[var].level == level) return variables[var].value;
diff --git a/src/script/functions/basic.cpp b/src/script/functions/basic.cpp
index d854b952..d7f9ba3a 100644
--- a/src/script/functions/basic.cpp
+++ b/src/script/functions/basic.cpp
@@ -110,14 +110,14 @@ SCRIPT_FUNCTION(to_int) {
 			} else if (str.empty()) {
 				result = 0;
 			} else {
-				return delayError(_ERROR_3_("can't convert value", str, input->typeName(), _TYPE_("integer")));
+				return delay_error(ScriptErrorConversion(str, input->typeName(), _TYPE_("integer")));
 			}
 		} else {
 			result = (int)*input;
 		}
 		SCRIPT_RETURN(result);
 	} catch (const ScriptError& e) {
-		return new_intrusive1<ScriptDelayedError>(e);
+		return delay_error(e);
 	}
 }
 
@@ -136,14 +136,14 @@ SCRIPT_FUNCTION(to_real) {
 			if (str.empty()) {
 				result = 0.0;
 			} else if (!str.ToDouble(&result)) {
-				return delayError(_ERROR_3_("can't convert value", str, input->typeName(), _TYPE_("double")));
+				return delay_error(ScriptErrorConversion(str, input->typeName(), _TYPE_("double")));
 			}
 		} else {
 			result = (double)*input;
 		}
 		SCRIPT_RETURN(result);
 	} catch (const ScriptError& e) {
-		return new_intrusive1<ScriptDelayedError>(e);
+		return delay_error(e);
 	}
 }
 
@@ -170,11 +170,11 @@ SCRIPT_FUNCTION(to_number) {
 			} else if (str.empty()) {
 				SCRIPT_RETURN(0);
 			} else {
-				return delayError(_ERROR_3_("can't convert value", str, input->typeName(), _TYPE_("double")));
+				return delay_error(ScriptErrorConversion(str, input->typeName(), _TYPE_("double")));
 			}
 		}
 	} catch (const ScriptError& e) {
-		return new_intrusive1<ScriptDelayedError>(e);
+		return delay_error(e);
 	}
 }
 
@@ -190,7 +190,7 @@ SCRIPT_FUNCTION(to_boolean) {
 		}
 		SCRIPT_RETURN(result);
 	} catch (const ScriptError& e) {
-		return new_intrusive1<ScriptDelayedError>(e);
+		return delay_error(e);
 	}
 }
 
@@ -199,7 +199,7 @@ SCRIPT_FUNCTION(to_color) {
 		SCRIPT_PARAM_C(AColor, input);
 		SCRIPT_RETURN(input);
 	} catch (const ScriptError& e) {
-		return new_intrusive1<ScriptDelayedError>(e);
+		return delay_error(e);
 	}
 }
 
diff --git a/src/script/functions/image.cpp b/src/script/functions/image.cpp
index 6ffd8f8c..5f6e8b10 100644
--- a/src/script/functions/image.cpp
+++ b/src/script/functions/image.cpp
@@ -124,7 +124,7 @@ SCRIPT_FUNCTION(symbol_variation) {
 	if (value) {
 		filename = value->filename;
 	} else if (valueO) {
-		throw ScriptError(_ERROR_2_("can't convert", valueO->typeName(), _TYPE_("symbol" )));
+		throw ScriptErrorConversion(valueO->typeName(), _TYPE_("symbol" ));
 	} else {
 		filename = from_script<String>(symbol);
 	}
diff --git a/src/script/functions/regex.cpp b/src/script/functions/regex.cpp
index c282aa05..51534741 100644
--- a/src/script/functions/regex.cpp
+++ b/src/script/functions/regex.cpp
@@ -192,6 +192,38 @@ SCRIPT_FUNCTION_SIMPLIFY_CLOSURE(break_text) {
 	return ScriptValueP();
 }
 
+// ----------------------------------------------------------------------------- : Rules : regex split
+
+SCRIPT_FUNCTION_WITH_SIMPLIFY(split_text) {
+	SCRIPT_PARAM_C(String, input);
+	SCRIPT_PARAM_C(ScriptRegexP, match);
+	SCRIPT_PARAM_DEFAULT_N(bool, _("include empty"), include_empty, true);
+	ScriptCustomCollectionP ret(new ScriptCustomCollection);
+	// find all matches
+	while (match->regex.Matches(input)) {
+		// match, append to result
+		size_t start, len;
+		bool ok = match->regex.GetMatch(&start, &len, 0);
+		assert(ok);
+		if (include_empty || start > 0) {
+			ret->value.push_back(to_script(input.substr(0,start)));
+		}
+		input = input.substr(start + len); // everything after the match
+	}
+	if (include_empty || !input.empty()) {
+		ret->value.push_back(to_script(input));
+	}
+	return ret;
+}
+SCRIPT_FUNCTION_SIMPLIFY_CLOSURE(split_text) {
+	FOR_EACH(b, closure.bindings) {
+		if (b.first == SCRIPT_VAR_match) {
+			b.second = regex_from_script(b.second); // pre-compile
+		}
+	}
+	return ScriptValueP();
+}
+
 // ----------------------------------------------------------------------------- : Rules : regex match
 
 SCRIPT_FUNCTION_WITH_SIMPLIFY(match) {
@@ -214,6 +246,7 @@ void init_script_regex_functions(Context& ctx) {
 	ctx.setVariable(_("replace"),              script_replace);
 	ctx.setVariable(_("filter text"),          script_filter_text);
 	ctx.setVariable(_("break text"),           script_break_text);
+	ctx.setVariable(_("split text"),           script_split_text);
 	ctx.setVariable(_("match"),                script_match);
 	ctx.setVariable(_("replace rule"),         new_intrusive1<ScriptRule>(script_replace));
 	ctx.setVariable(_("filter rule"),          new_intrusive1<ScriptRule>(script_filter_text));
diff --git a/src/script/parser.cpp b/src/script/parser.cpp
index b7b77044..598e5d13 100644
--- a/src/script/parser.cpp
+++ b/src/script/parser.cpp
@@ -625,7 +625,7 @@ void parseExpr(TokenIterator& input, Script& script, Precedence minPrec) {
 void parseOper(TokenIterator& input, Script& script, Precedence minPrec, InstructionType closeWith, int closeWithData) {
 	size_t added = script.getInstructions().size(); // number of instructions added
 	parseExpr(input, script, minPrec); // first argument
-	added -= script.getInstructions().size();
+	added = script.getInstructions().size() - added;
 	// read any operators after an expression
 	// EBNF:                    expr = expr | expr oper expr
 	// without left recursion:  expr = expr (oper expr)*
@@ -649,7 +649,7 @@ void parseOper(TokenIterator& input, Script& script, Precedence minPrec, Instruc
 			// We made a mistake, the part before the := should be a variable name,
 			// not an expression. Remove that instruction.
 			Instruction& instr = script.getInstructions().back();
-			if (added == 1 && instr.instr != I_GET_VAR) {
+			if (added != 1 || instr.instr != I_GET_VAR) {
 				input.add_error(_("Can only assign to variables"));
 			}
 			script.getInstructions().pop_back();
@@ -695,9 +695,9 @@ void parseOper(TokenIterator& input, Script& script, Precedence minPrec, Instruc
 			} else {
 				input.expected(_("name"));
 			}
-		} else if (minPrec <= PREC_FUN && token==_("[")) { // get member by expr
+		} else if (minPrec <= PREC_FUN && token==_("[") && !token.newline) { // get member by expr
 			size_t before = script.getInstructions().size();
-			parseOper(input, script, PREC_ALL);
+			parseOper(input, script, PREC_SET);
 			if (script.getInstructions().size() == before + 1 && script.getInstructions().back().instr == I_PUSH_CONST) {
 				// optimize:
 				//   PUSH_CONST x
@@ -709,7 +709,7 @@ void parseOper(TokenIterator& input, Script& script, Precedence minPrec, Instruc
 				script.addInstruction(I_BINARY, I_MEMBER);
 			}
 			expectToken(input, _("]"), &token);
-		} else if (minPrec <= PREC_FUN && token==_("(")) {
+		} else if (minPrec <= PREC_FUN && token==_("(") && !token.newline) {
 			// function call, read arguments
 			vector<Variable> arguments;
 			parseCallArguments(input, script, arguments);
diff --git a/src/script/to_value.hpp b/src/script/to_value.hpp
index b318bf29..d90d00b4 100644
--- a/src/script/to_value.hpp
+++ b/src/script/to_value.hpp
@@ -79,9 +79,12 @@ class ScriptDelayedError : public ScriptValue {
 	ScriptError error; // the error message
 };
 
-inline ScriptValueP delayError(const String& m) {
+inline ScriptValueP delay_error(const String& m) {
 	return new_intrusive1<ScriptDelayedError>(ScriptError(m));
 }
+inline ScriptValueP delay_error(const ScriptError& error) {
+	return new_intrusive1<ScriptDelayedError>(error);
+}
 
 // ----------------------------------------------------------------------------- : Iterators
 
@@ -93,6 +96,7 @@ struct ScriptIterator : public ScriptValue {
 	
 	/// Return the next item for this iterator, or ScriptValueP() if there is no such item
 	virtual ScriptValueP next(ScriptValueP* key_out = nullptr) = 0;
+	virtual ScriptValueP makeIterator(const ScriptValueP& thisP) const;
 };
 
 // make an iterator over a range
@@ -161,7 +165,7 @@ ScriptValueP get_member(const map<String,V>& m, const String& name) {
 	if (it != m.end()) {
 		return to_script(it->second);
 	} else {
-		return delayError(_ERROR_2_("has no member", _TYPE_("collection"), name));
+		return delay_error(ScriptErrorNoMember(_TYPE_("collection"), name));
 	}
 }
 
@@ -171,7 +175,7 @@ ScriptValueP get_member(const IndexMap<K,V>& m, const String& name) {
 	if (it != m.end()) {
 		return to_script(*it);
 	} else {
-		return delayError(_ERROR_2_("has no member", _TYPE_("collection"), name));
+		return delay_error(ScriptErrorNoMember(_TYPE_("collection"), name));
 	}
 }
 
@@ -389,7 +393,7 @@ inline ScriptValueP to_script(const Defaultable<T>& v) { return to_script(v());
 template <typename T> inline T  from_script              (const ScriptValueP& value) {
 	ScriptObject<T>* o = dynamic_cast<ScriptObject<T>*>(value.get());
 	if (!o) {
-		throw ScriptError(_ERROR_2_("can't convert", value->typeName(), _TYPE_("object" )));
+		throw ScriptErrorConversion(value->typeName(), _TYPE_("object" ));
 	}
 	return o->getValue();
 }
diff --git a/src/script/value.cpp b/src/script/value.cpp
index e135024f..6971ae4e 100644
--- a/src/script/value.cpp
+++ b/src/script/value.cpp
@@ -19,16 +19,16 @@ DECLARE_TYPEOF_COLLECTION(pair<Variable COMMA ScriptValueP>);
 // ----------------------------------------------------------------------------- : ScriptValue
 // Base cases
 
-ScriptValue::operator String()                              const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("string" ))); }
-ScriptValue::operator int()                                 const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("integer" ))); }
-ScriptValue::operator bool()                                const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("boolean" ))); }
-ScriptValue::operator double()                              const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("double"  ))); }
-ScriptValue::operator AColor()                              const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("color"   ))); }
-ScriptValueP ScriptValue::eval(Context&)                    const { return delayError(_ERROR_2_("can't convert", typeName(), _TYPE_("function"))); }
+ScriptValue::operator String()                              const { throw ScriptErrorConversion(typeName(), _TYPE_("string" )); }
+ScriptValue::operator int()                                 const { throw ScriptErrorConversion(typeName(), _TYPE_("integer" )); }
+ScriptValue::operator bool()                                const { throw ScriptErrorConversion(typeName(), _TYPE_("boolean" )); }
+ScriptValue::operator double()                              const { throw ScriptErrorConversion(typeName(), _TYPE_("double"  )); }
+ScriptValue::operator AColor()                              const { throw ScriptErrorConversion(typeName(), _TYPE_("color"   )); }
+ScriptValueP ScriptValue::eval(Context&)                    const { return delay_error(ScriptErrorConversion(typeName(), _TYPE_("function"))); }
 ScriptValueP ScriptValue::next(ScriptValueP* key_out)             { throw InternalError(_("Can't convert from ")+typeName()+_(" to iterator")); }
-ScriptValueP ScriptValue::makeIterator(const ScriptValueP&) const { return delayError(_ERROR_2_("can't convert", typeName(), _TYPE_("collection"))); }
-int          ScriptValue::itemCount()                       const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("collection"))); }
-GeneratedImageP ScriptValue::toImage(const ScriptValueP&)   const { throw ScriptError(_ERROR_2_("can't convert", typeName(), _TYPE_("image"   ))); }
+ScriptValueP ScriptValue::makeIterator(const ScriptValueP&) const { return delay_error(ScriptErrorConversion(typeName(), _TYPE_("collection"))); }
+int          ScriptValue::itemCount()                       const { throw ScriptErrorConversion(typeName(), _TYPE_("collection")); }
+GeneratedImageP ScriptValue::toImage(const ScriptValueP&)   const { throw ScriptErrorConversion(typeName(), _TYPE_("image"   )); }
 String       ScriptValue::toCode()                          const { return *this; }
 CompareWhat  ScriptValue::compareAs(String& compare_str, void const*& compare_ptr) const {
 	compare_str = toCode();
@@ -39,11 +39,11 @@ ScriptValueP ScriptValue::getMember(const String& name) const {
 	if (name.ToLong(&index)) {
 		return getIndex(index);
 	} else {
-		return delayError(_ERROR_2_("has no member", typeName(), name));
+		return delay_error(ScriptErrorNoMember(typeName(), name));
 	}
 }
 ScriptValueP ScriptValue::getIndex(int index) const {
-	return delayError(_ERROR_2_("has no member", typeName(), String()<<index));
+	return delay_error(ScriptErrorNoMember(typeName(), String()<<index));
 }
 
 
@@ -122,6 +122,7 @@ ScriptValueP ScriptDelayedError::makeIterator(const ScriptValueP& thisP) const
 ScriptType ScriptIterator::type() const { return SCRIPT_ITERATOR; }
 String ScriptIterator::typeName() const { return _("iterator"); }
 CompareWhat ScriptIterator::compareAs(String&, void const*&) const { return COMPARE_NO; }
+ScriptValueP ScriptIterator::makeIterator(const ScriptValueP& thisP) const { return thisP; }
 
 // Iterator over a range of integers
 class ScriptRangeIterator : public ScriptIterator {
@@ -248,7 +249,7 @@ class ScriptString : public ScriptValue {
 		if (value.ToDouble(&d)) {
 			return d;
 		} else {
-			throw ScriptError(_ERROR_3_("can't convert value", value, typeName(), _TYPE_("double")));
+			throw ScriptErrorConversion(value, typeName(), _TYPE_("double"));
 		}
 	}
 	virtual operator int()    const {
@@ -256,7 +257,7 @@ class ScriptString : public ScriptValue {
 		if (value.ToLong(&l)) {
 			return l;
 		} else {
-			throw ScriptError(_ERROR_3_("can't convert value", value, typeName(), _TYPE_("integer")));
+			throw ScriptErrorConversion(value, typeName(), _TYPE_("integer"));
 		}
 	}
 	virtual operator bool()   const {
@@ -265,13 +266,13 @@ class ScriptString : public ScriptValue {
 		} else if (value == _("no") || value == _("false") || value.empty()) {
 			return false;
 		} else {
-			throw ScriptError(_ERROR_3_("can't convert value", value, typeName(), _TYPE_("boolean")));
+			throw ScriptErrorConversion(value, typeName(), _TYPE_("boolean"));
 		}
 	}
 	virtual operator AColor() const {
 		AColor c = parse_acolor(value);
 		if (!c.Ok()) {
-			throw ScriptError(_ERROR_3_("can't convert value", value, typeName(), _TYPE_("color")));
+			throw ScriptErrorConversion(value, typeName(), _TYPE_("color"));
 		}
 		return c;
 	}
@@ -285,7 +286,7 @@ class ScriptString : public ScriptValue {
 		if (name.ToLong(&index) && index >= 0 && (size_t)index < value.size()) {
 			return to_script(String(1,value[index]));
 		} else {
-			return delayError(_ERROR_2_("has no member value", value, name));
+			return delay_error(_ERROR_2_("has no member value", value, name));
 		}
 	}
   private:
diff --git a/src/util/error.hpp b/src/util/error.hpp
index ff05cb5f..9c9e93ab 100644
--- a/src/util/error.hpp
+++ b/src/util/error.hpp
@@ -108,6 +108,28 @@ class ScriptError : public Error {
 	inline ScriptError(const String& str) : Error(str) {}
 };
 
+/// "Variable not set"
+class ScriptErrorNoVariable : public ScriptError {
+  public:
+	inline ScriptErrorNoVariable(const String& var) : ScriptError(_("Variable not set: ") + var) {}
+};
+
+/// "Can't convert from A to B"
+class ScriptErrorConversion : public ScriptError {
+  public:
+	inline ScriptErrorConversion(const String& a, const String& b)
+		: ScriptError(_ERROR_2_("can't convert", a, b)) {}
+	inline ScriptErrorConversion(const String& value, const String& a, const String& b)
+		: ScriptError(_ERROR_3_("can't convert value", value, a, b)) {}
+};
+
+/// "A has no member B"
+class ScriptErrorNoMember : public ScriptError {
+  public:
+	inline ScriptErrorNoMember(const String& type, const String& member)
+		: ScriptError(_ERROR_2_("has no member", type, member)) {}
+};
+
 // ----------------------------------------------------------------------------- : Error handling
 
 /// Should errors be written to stdout?
diff --git a/src/util/tagged_string.cpp b/src/util/tagged_string.cpp
index 112357db..d6f0373f 100644
--- a/src/util/tagged_string.cpp
+++ b/src/util/tagged_string.cpp
@@ -307,9 +307,12 @@ void cursor_to_index_range(const String& str, size_t cursor, size_t& start, size
 			if (cur == cursor) start = i;
 		}
 	}
-	end = min(i, size);
-	if (cur < cursor) start = end = size;
-	if (end <= start) end = start + 1;
+	if (cur < cursor) {
+		start = end = size;
+	} else {
+		end = min(i, size);
+	}
+	end = max(end, start + 1); // always start < end, since there are always valid cursor positions
 }
 
 size_t cursor_to_index(const String& str, size_t cursor, Movement dir) {