IsRegex function added! (issue#155)

validator.go

@@ -192,6 +192,18 @@ func IsUTFLetterNumeric(str string) bool {
 
 }
 
+// IsRegex checks if the string is a valid regex. Empty string is valid.
+func IsRegex(str string) bool {
+	if IsNull(str) {
+		return true
+	}
+	_, err := regexp.Compile(str)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
 // IsNumeric checks if the string contains only numbers. Empty string is valid.
 func IsNumeric(str string) bool {
 	if IsNull(str) {

validator_test.go

@@ -468,6 +468,32 @@ func TestIsLowerCase(t *testing.T) {
 	}
 }
 
+func TestIsRegex(t *testing.T) {
+	t.Parallel()
+
+	var tests = []struct {
+		param    string
+		expected bool
+	}{
+		{"", true},
+		{"p([a-z]+)ch", true},
+		{"//", true},
+		{"/[0-9]+/", true},
+		{"^a.b$", true},
+		{"[", false},
+		{"*", false},
+		{"+*^", false},
+		{"[0-9]++", false},
+		{"[)", false},
+	}
+	for _, test := range tests {
+		actual := IsRegex(test.param)
+		if actual != test.expected {
+			t.Errorf("Expected IsRegex(%q) to be %v, got %v", test.param, test.expected, actual)
+		}
+	}
+}
+
 func TestIsUpperCase(t *testing.T) {
 	t.Parallel()