How can I detect text language with flutter

Question

I need a package that detects and returns the text language. Do you have a flutter package recommendation for this? If you know of any other method besides the packages, I'd be happy to hear it.

Answer 1

You can use a solution without packages using RegExp. Returns 'en' by default or a string representing the detected language code (you can also add country/region subtag).

String detectLanguage({required String string}) {

String languageCodes = 'en';

final RegExp persian = RegExp(r'^[\u0600-\u06FF]+');
final RegExp english = RegExp(r'^[a-zA-Z]+');
final RegExp arabic = RegExp(r'^[\u0621-\u064A]+');
final RegExp chinese = RegExp(r'^[\u4E00-\u9FFF]+');
final RegExp japanese = RegExp(r'^[\u3040-\u30FF]+');
final RegExp korean = RegExp(r'^[\uAC00-\uD7AF]+');
final RegExp ukrainian = RegExp(r'^[\u0400-\u04FF\u0500-\u052F]+');
final RegExp russian = RegExp(r'^[\u0400-\u04FF]+');
final RegExp italian = RegExp(r'^[\u00C0-\u017F]+');
final RegExp french = RegExp(r'^[\u00C0-\u017F]+');
final RegExp spanish = RegExp(r'[\u00C0-\u024F\u1E00-\u1EFF\u2C60-\u2C7F\uA720-\uA7FF\u1D00-\u1D7F]+');

if (persian.hasMatch(string)) languageCodes = 'fa';
if (english.hasMatch(string)) languageCodes = 'en';
if (arabic.hasMatch(string)) languageCodes = 'ar';
if (chinese.hasMatch(string)) languageCodes = 'zh';
if (japanese.hasMatch(string)) languageCodes = 'ja';
if (korean.hasMatch(string)) languageCodes = 'ko';
if (russian.hasMatch(string)) languageCodes = 'ru';
if (ukrainian.hasMatch(string)) languageCodes = 'uk';
if (italian.hasMatch(string)) languageCodes = 'it';
if (french.hasMatch(string)) languageCodes = 'fr';
if (spanish.hasMatch(string)) languageCodes = 'es';

return languageCode;
}

Answer 2

You can check string lang like this:

  var persian = RegExp(r'[\u0600-\u06FF]');
  var english = RegExp(r'[a-zA-Z]');
  var arabic = RegExp(r'[\u0750-\u077F]');
  var chinese = RegExp(r'[\u4E00-\u9FFF]');
  var japanese = RegExp(r'[\u3040-\u309F]');
  var korean = RegExp(r'[\uAC00-\uD7AF]');
  
  if (persian.hasMatch(str)) {
    logger.d('persian');
  } else if (english.hasMatch(str)) {
    logger.d('english');
  } else if (arabic.hasMatch(str)) {
    logger.d('arabic');
  } else if (chinese.hasMatch(str)) {
    logger.d('chinese');
  } else if (japanese.hasMatch(str)) {
    logger.d('japanese');
  } else if (korean.hasMatch(str)) {
    logger.d('korean');
  } else {
    logger.d('other');
  }