Basics of Dart extension.

extension_methods.dart

extension StringExtension on String {
  bool get isValidEmail {
    final emailRegExp = RegExp(r"^[a-zA-Z0-9.]+@[a-zA-Z0-9]+\.[a-zA-Z]+");
    return emailRegExp.hasMatch(this);
  }
  
  /*
   * In Documentation its supported with implementation as :
   * 
   * String operator &(String other) => '$this $other';
   * 
   * */
  
   String concatWithSpace(String other) {
    return '$this $other';
  }
  
}

void main(){
  
    
  dynamic ans   =  'bruno@bruno.com'.isValidEmail;
  
  'hello'.concatWithSpace('Bruno')
  
}