verifiedString method
Implementation
String? verifiedString(
String? value, {
bool url = false,
bool counterRef = false,
bool objectRef = false,
}) {
if (value == null) return null;
if (value.isEmpty) return null;
if (url && !value.startsWith("https://")) return null;
if (counterRef && !value.startsWith("#")) return null;
if (objectRef && !value.startsWith("@")) return null;
return value;
}