Initial cloud-services repo - gateway service + pkg modules

pkg/validator/email.go

@@ -0,0 +1,15 @@
+package validator
+
+import (
+	"regexp"
+
+	"github.com/go-playground/validator/v10"
+)
+
+func validateEmail(fl validator.FieldLevel) bool {
+	s := fl.Field().String()
+	isEmail, _ := regexp.Match(`^\w([\w\-_+]*(\.[\w\-_+]+)?)*@(\w+[\-.])+\w{2,}$`, []byte(s))
+	hasValidSize, _ := regexp.Match(`^.{0,64}@.{0,63}$`, []byte(s))
+
+	return isEmail && hasValidSize
+}