sanitize function
Implementation
String sanitize(String str) {
final String val = str.replaceAll(RegExp(r'^\s*', multiLine: true), '');
final RegExp whiteList =
RegExp(r'^((https?|s?ftp|file|blob|mailto|tel):|#|/|data:image/)');
if (whiteList.hasMatch(val)) {
return val;
}
return 'unsafe:$val';
}