How to delete/detect any emoji as a whole from a string in Flutter?

Question

I would like to simulate a keyboard backspace delete event from a string in Flutter (or Dart). Something like:

String str = "hello🇵🇬你们😀😀👨‍👩‍👦"
myBackspace(str) // will return "hello🇵🇬你们😀😀"
myBackspace(str) // will return "hello🇵🇬你们😀"
myBackspace(str) // will return "hello🇵🇬你们"
myBackspace(str) // will return "hello🇵🇬你"
myBackspace(str) // will return "hello🇵🇬"
myBackspace(str) // will return "hello"
myBackspace(str) // will return "hell"

Answer 1

String formatText(String str) {

final RegExp regExp = RegExp(r'(?:[\u2700-\u27bf]|(?:\ud83c[\udde6-\uddff]){2}|[\ud800-\udbff][\udc00-\udfff]|[\u0023-\u0039]\ufe0f?\u20e3|\u3299|\u3297|\u303d|\u3030|\u24c2|\ud83c[\udd70-\udd71]|\ud83c[\udd7e-\udd7f]|\ud83c\udd8e|\ud83c[\udd91-\udd9a]|\ud83c[\udde6-\uddff]|\ud83c[\ude01-\ude02]|\ud83c\ude1a|\ud83c\ude2f|\ud83c[\ude32-\ude3a]|\ud83c[\ude50-\ude51]|\u203c|\u2049|[\u25aa-\u25ab]|\u25b6|\u25c0|[\u25fb-\u25fe]|\u00a9|\u00ae|\u2122|\u2139|\ud83c\udc04|[\u2600-\u26FF]|\u2b05|\u2b06|\u2b07|\u2b1b|\u2b1c|\u2b50|\u2b55|\u231a|\u231b|\u2328|\u23cf|[\u23e9-\u23f3]|[\u23f8-\u23fa]|\ud83c\udccf|\u2934|\u2935|[\u2190-\u21ff])');

if(str.contains(regExp)){
  str = str.replaceAll(regExp,'');
}

return str; }

Ex: Go to https://dartpad.dev/ to test:

String str = "ThaiKV受け行くけどよね😞😞😍😰😒😜" => ThaiKV受け行くけどよね