Added IsValidEmail function

string_utils/string_utils.go

@@ -304,3 +304,10 @@ func StripQueryString(inputUrl string) (string, error) {
 	u.RawQuery = ""
 	return u.String(), nil
 }
+
+func IsValidEmail(email string) bool {
+	// Found here: https://stackoverflow.com/questions/201323/how-can-i-validate-an-email-address-using-a-regular-expression
+	regex, _ := regexp.Compile("(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])")
+	isValidEmail := regex.MatchString(email)
+	return isValidEmail
+}

string_utils/string_utils_test.go

+package string_utils
+
+import "testing"
+
+func TestIsValidEmail(t *testing.T) {
+	type args struct {
+		email string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "valid",
+			args: args{email: "johandk@uafrica.com"},
+			want: true,
+		},
+		{
+			name: "invalid",
+			args: args{email: "johandk@@uafrica.com"},
+			want: false,
+		},
+		{
+			name: "invalid",
+			args: args{email: "johandk@uafricacom"},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsValidEmail(tt.args.email); got != tt.want {
+				t.Errorf("IsValidEmail() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}