String util for valid username check

string_utils/string_utils.go

@@ -82,6 +82,11 @@ func IsAlphaNumericOrDash(str string) bool {
 	return regex.MatchString(str)
 }
 
+func IsValidUsername(str string) bool {
+	regex := regexp.MustCompile("^[a-zA-Z0-9-.@]*$")
+	return regex.MatchString(str)
+}
+
 func Equal(a string, b string) bool {
 	return strings.TrimSpace(strings.ToLower(a)) == strings.TrimSpace(strings.ToLower(b))
 }