fix(templates): only match alphanumeric strings

relates to #2956

src/template/text.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"errors"
 	"oh-my-posh/environment"
+	"oh-my-posh/regex"
 	"strings"
 	"text/template"
 )
@@ -82,15 +83,16 @@ func (t *Text) cleanTemplate() {
 	}
 
 	knownVariable := func(variable string) bool {
-		if variable == "." {
-			return true
-		}
 		variable = strings.TrimPrefix(variable, ".")
 		splitted := strings.Split(variable, ".")
 		if len(splitted) == 0 {
-			return false
+			return true
 		}
 		variable = splitted[0]
+		// check if alphanumeric
+		if !regex.MatchString(`^[a-zA-Z0-9]+$`, variable) {
+			return true
+		}
 		for _, b := range knownVariables {
 			if variable == b {
 				return true

src/template/text_test.go

@@ -225,6 +225,11 @@ func TestCleanTemplate(t *testing.T) {
 		Expected string
 		Template string
 	}{
+		{
+			Case:     "Literal dots",
+			Expected: " ... ",
+			Template: " ... ",
+		},
 		{
 			Case:     "Literal dot",
 			Expected: "hello . what's up",