Flutter Function Library

function_helper.dart

/*** 1. Regex Validation Email ***/
String email = '[email protected]';
bool isValidEmail =  RegExp(r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+").hasMatch(email);

/*** 2. Hide Partial Email Address ***/
 String email = "[email protected]";  
 int leftChar = 1; // num of left character to show
 int rightChar = 2; // num of right character to show
 int hideChar = email.split("@")[0].length - rightChar; 
 String result = email.replaceRange(leftChar, hideChar, '*' * (hideChar-leftChar));
 // Result : j****[email protected]

 /*** 3. Word First Capital ***/
 String word = 'John Doe';
 String result = word[0].toUpperCase()+word.substring(1).toLowerCase();
 // Result : John doe

/*** 4. Proper ***/
 String word = 'john doe';
 String result = word.split(" ").map((str) => str[0].toUpperCase()+str.substring(1).toLowerCase()).join(" ");
 // Result : John Doe

/*** 5. Get Inital Word ***/
 String word = 'john doe';
 String result = word.trim().split(' ').map((l) => l[0].toUpperCase()).join();
 // Result : JD

/*** 6. Get inital word only 2 digit ***/
 String word = 'Michael John Doe';
 String result = word.trim().split(' ').map((l) => l[0].toUpperCase()).take(2).join();
 // Result : MJ
 
 /*** 7. Word Propper ***/
 String wordPropper({required String text, List<String>? except}) {
  final _spaceRegex = RegExp(r"\s+");
  String cleanSpace = text.trim().replaceAll(_spaceRegex, " ");
  
  String result = cleanSpace.split(" ").map((str) => except!=null ? except.contains(str) ? str : str[0].toUpperCase()+str.substring(1).toLowerCase() : str[0].toUpperCase()+str.substring(1).toLowerCase()).join(" ");
  return result;
}
 ex : wordPropper(text:"bank BRI DKI jakarta", except: ['DKI', 'BRI']);
 // Result : Bank BRI DKI Jakarta