improve kebab-case

rule_kebabcase.go

@@ -29,10 +29,10 @@ func (rule *RuleKebabCase) SetParameters(params []string) error {
 }
 
 // Validate checks if string is kebab case
-// false if rune is no lowercase letter or -
+// false if rune is no lowercase letter, digit or -
 func (rule *RuleKebabCase) Validate(value string) (bool, error) {
 	for _, c := range value {
-		if c == 45 { // -
+		if c == 45 || unicode.IsDigit(c) { // 45 => -
 			continue
 		}
 

rule_kebabcase_test.go

@@ -14,6 +14,9 @@ func TestRuleKebabCase(t *testing.T) {
 		{value: "KEBABCASE", expected: false, err: nil},
 		{value: "kebab-case", expected: true, err: nil},
 		{value: "kebab-case-test", expected: true, err: nil},
+		{value: "kebab-123-test", expected: true, err: nil},
+		{value: "kebab.test", expected: false, err: nil},
+		{value: "kebab_test", expected: false, err: nil},
 	}
 
 	var i = 0