separately check if a pattern is wild

wildcard.go

@@ -1,7 +1,5 @@
 package wildcard
 
-import "strings"
-
 type Matcher struct {
 	S byte
 	M byte
@@ -14,6 +12,21 @@ func NewMatcher() *Matcher {
 	}
 }
 
+func (m *Matcher) isWildPattern(pattern string) bool {
+	for i := range pattern {
+		c := pattern[i]
+		if c == m.M {
+			return true
+		}
+
+		if c == m.S {
+			return true
+		}
+	}
+
+	return false
+}
+
 func (m *Matcher) Match(pattern string, s string) (bool, error) {
 	// Edge cases.
 	if pattern == string(m.M) {
@@ -29,8 +42,7 @@ func (m *Matcher) Match(pattern string, s string) (bool, error) {
 
 	// If pattern does not contain wildcard chars, just compare the strings
 	// to avoid extra memory allocation.
-	if !strings.Contains(pattern, string(m.M)) &&
-		!strings.Contains(pattern, string(m.S)) {
+	if !m.isWildPattern(pattern) {
 		return pattern == s, nil
 	}
 

wildcard_test.go

@@ -6,15 +6,60 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-type testCase struct {
+type wildPatternTestCase struct {
+	p string
+	m bool
+}
+
+type matchTestCase struct {
 	p string
 	s string
 	m bool
 }
 
+func TestIsWildPattern(t *testing.T) {
+	testCases1 := []wildPatternTestCase{
+		{"*", true},
+		{"**", true},
+		{"*?", true},
+		{"?", true},
+		{".", false},
+		{"a", false},
+		{"a?c", true},
+	}
+
+	m1 := NewMatcher()
+	for _, tc := range testCases1 {
+		b := m1.isWildPattern(tc.p)
+		if !assert.Equal(t, b, tc.m) {
+			println(tc.p, tc.m)
+		}
+	}
+
+	testCases2 := []wildPatternTestCase{
+		{"*", true},
+		{"**", true},
+		{"*.", true},
+		{"?", false},
+		{".", true},
+		{"a", false},
+		{"a.c", true},
+	}
+
+	m2 := NewMatcher()
+	m2.S = '.'
+	for _, tc := range testCases2 {
+		b := m2.isWildPattern(tc.p)
+		if !assert.Equal(t, b, tc.m) {
+			println(tc.p, tc.m)
+		}
+	}
+
+}
+
 func TestMatch(t *testing.T) {
 
-	testCases1 := []testCase{
+	testCases1 := []matchTestCase{
 		{"", "", true},
 		{"*", "", true},
 		{"?", "", false},
@@ -43,7 +88,7 @@ func TestMatch(t *testing.T) {
 	m2 := NewMatcher()
 	m2.S = '.'
 
-	testCases2 := []testCase{
+	testCases2 := []matchTestCase{
 		{"", "", true},
 		{"*", "", true},
 		{".", "", false},