StringBuilder text = new StringBuilder("It's SO very RUDE to shout!");
Matcher m = Pattern.compile("\\b[\\p{Lu}\\p{Lt}]+\\b").matcher(text);

while (m.find())
   text.replace(m.start(), m.end(), m.group().toLowerCase());

System.out.println(text);




-----------------------------------------------------------------------------
Copyright 1997-2024 Jeffrey Friedl