diff --git a/pkg/parser/ast/tokenizer.go b/pkg/parser/ast/tokenizer.go
index 85788ea..151c902 100644
--- a/pkg/parser/ast/tokenizer.go
+++ b/pkg/parser/ast/tokenizer.go
@@ -73,7 +73,7 @@ var keywordRegex1 = regexp.MustCompile(`(?i)^(and|or|not|abs|sqrt|sin|cos|tan|as
 var keywordRegex2 = regexp.MustCompile(`(?i)^(if|then|else|end|goto)`)
 var keywordRegexes = []*regexp.Regexp{keywordRegex1, keywordRegex2}
 
-var identifierRegex = regexp.MustCompile("^:?[a-zA-Z]+[a-zA-Z0-9_]*")
+var identifierRegex = regexp.MustCompile("^:[a-zA-Z0-9_]+|^[a-zA-Z]+[a-zA-Z0-9_]*")
 
 var numberRegex = regexp.MustCompile("^[0-9]+(\\.[0-9]+)?")
 
diff --git a/pkg/parser/ast/tokenizer_test.go b/pkg/parser/ast/tokenizer_test.go
index 7cde1ce..4e7b8ee 100644
--- a/pkg/parser/ast/tokenizer_test.go
+++ b/pkg/parser/ast/tokenizer_test.go
@@ -18,6 +18,7 @@ func TestTokenizer(t *testing.T) {
 	// comment 2
 	:var = "another\"test"
 	:foo = (1+2.75)*3
+	:_=1
 	`
 
 	expected := `Line: 1, Coloumn: 1, Type: Newline
@@ -116,6 +117,11 @@ func TestTokenizer(t *testing.T) {
 	Line: 10, Coloumn: 18, Type: Number, Value: '3'
 	Line: 10, Coloumn: 19, Type: Newline
 	Line: 11, Coloumn: 1, Type: Whitespace, Value: '	'
+	Line: 11, Coloumn: 2, Type: ID, Value: ':_'
+	Line: 11, Coloumn: 4, Type: Symbol, Value: '='
+	Line: 11, Coloumn: 5, Type: Number, Value: '1'
+	Line: 11, Coloumn: 6, Type: Newline
+	Line: 12, Coloumn: 1, Type: Whitespace, Value: '	'
 	`
 
 	tk := ast.NewTokenizer()