lowerCaseLettersOnly method

  1. @useResult
String lowerCaseLettersOnly()

Extracts only ASCII lowercase letter characters (a-z) from this string.

Example:

'Hello123World!'.lowerCaseLettersOnly(); // 'elloorld'
'ABC-def'.lowerCaseLettersOnly(); // 'def'
'123'.lowerCaseLettersOnly(); // ''

Implementation

@useResult
String lowerCaseLettersOnly() {
  if (isEmpty) {
    return '';
  }

  return replaceAll(_lowerCaseOnlyRegex, '');
}