escape method
Replaces HTML entities <, >, &, ', and " with their respective HTML entities.
Implementation
String escape() => replaceAll(RegExp(r'&'), '&')
.replaceAll(RegExp(r'"'), '"')
.replaceAll(RegExp(r"'"), ''')
.replaceAll(RegExp(r'<'), '<')
.replaceAll(RegExp(r'>'), '>');