diff --git a/dict-set-context_test.go b/dict-set-context_test.go
index a2cbb10..1a32709 100644
--- a/dict-set-context_test.go
+++ b/dict-set-context_test.go
@@ -35,6 +35,9 @@ func TestNewDictSetContext(t *testing.T) {
 	now := time.Now()
 	yday := now.Add(-24 * time.Hour)
 	inputs := []inputType{
+		{ctx1, "${|__default two|__map : 'one:1' 'two:2' 'six:6'}", "2", nil},
+		{ctx1, "${|__default two|__map : 'one:1' 'TWO:2' 'six:6'}", "", nil},
+		{ctx1, "${|__default two|__mapNC : 'one:1' 'TWO:2' 'six:6'}", "2", nil},
 		{ctx2, `form: ${|__time-fmt now ""}`, fmt.Sprintf("form: %d-%02d-%02d %02d:%02d:%02d", now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second()), nil},
 		{ctx2, `form: ${|__time-fmt now "%-D"}`, fmt.Sprintf("form: %d-%d-%d", now.Year(), now.Month(), now.Day()), nil},
 		{ctx2, `form: ${|__time-fmt now "%:T"}`, fmt.Sprintf("form: %d:%d:%d", now.Hour(), now.Minute(), now.Second()), nil},
diff --git a/expander-base-funcs.go b/expander-base-funcs.go
index 2b7878a..134649c 100644
--- a/expander-base-funcs.go
+++ b/expander-base-funcs.go
@@ -84,6 +84,35 @@ func ExFuncTrimSuffix(ctx ExpanderContext, varValue string, args []string) (resu
 	return
 }
 
+func ExFuncMap(ctx ExpanderContext, varValue string, args []string) (result string, err error) {
+	sep := args[0]
+	for _, pairSpec := range args[1:] {
+		pair := strings.SplitN(pairSpec, sep, 2)
+		if pair[0] == varValue {
+			if len(pair) == 2 {
+				result = pair[1]
+			}
+			break
+		}
+	}
+	return
+}
+
+func ExFuncMapNC(ctx ExpanderContext, varValue string, args []string) (result string, err error) {
+	sep := args[0]
+	varValue = strings.ToLower(varValue)
+	for _, pairSpec := range args[1:] {
+		pair := strings.SplitN(pairSpec, sep, 2)
+		if strings.ToLower(pair[0]) == varValue {
+			if len(pair) == 2 {
+				result = pair[1]
+			}
+			break
+		}
+	}
+	return
+}
+
 func AddBaseFuncs(ctx ExpanderContext) ExpanderContext {
 	ctx.AddFunc("__default", ExFuncDefault, 0, -1, "Returns the flow value if not empty, else all args joined; first arg is used as separator.")
 	ctx.AddFunc("__get", ExFuncGet, 0, 2, "Returns the value of the specified variable (arg1). With no arguments it returns the value of the variable having the flow value as name (same as __get ${.}). Arg2 is the default value. ")
@@ -92,5 +121,7 @@ func AddBaseFuncs(ctx ExpanderContext) ExpanderContext {
 	ctx.AddFunc("__lower", ExFuncLower, 0, 0, "Changes the flow value to lower case.")
 	ctx.AddFunc("__upper", ExFuncUpper, 0, 0, "Changes the flow value to upper case.")
 	ctx.AddFunc("__trim-suffix", ExFuncTrimSuffix, 1, 1, "Removes the specified suffix (arg1) from the flow.")
+	ctx.AddFunc("__map", ExFuncMap, 1, 1, "Returns the value mapped by the flow value as a key; e.g. two __map : 'one:1' 'two:2' 'six:6' returns 2")
+	ctx.AddFunc("__mapNC", ExFuncMapNC, 1, 1, "Same as __map but this comapares keys ignoring case differencies; e.g. two __map : 'ONE:1' 'Two:2' 'sIX:6' returns 2")
 	return ctx
 }