addLetters method
Example: var regex = FluentRegex().characterSet(CharacterSet().addLetters()); expect(regex.hasMatch('a'), true); expect(regex.hasMatch('B'), true); expect(regex.hasMatch('3'), false);
Implementation
CharacterSet addLetters([CaseType caseType = CaseType.lowerAndUpper]) {
if (caseType.hasLower) addRange('a', 'z');
if (caseType.hasUpper) addRange('A', 'Z');
return this;
}