Regular Expression - uppercase the first letter.

Question

I'm trying to process a String so that sentences without a starting capital letter have that letter made uppercase. The code I have so far is:
import java.util.regex.*;
public class TestRegexp{
     public static void main(String[] args){
          String myString = new String("Hello. capital");
          // TODO: Fix this so that it does uppercase the first letter
          String pattern = new String("\\.\\s+\\w");
          Pattern r = Pattern.compile(pattern);
          Matcher n = r.matcher(newString);
          String newString = n.replaceAll("\\. " + "\\w".toUpperCase());
          System.out.println(newString);
I want the output to be:
Hello. Capital
But this doesn't work. Is there a way to do this using the java.util.regex library and thus avoiding the StringTokeniser route?
Thanks.

Answer 1

The regex package doesn't provide a direct way to do what you want, but you can manage it by using some lower-level methods of the Matcher class:
Public String capitalizeSentences(String str)
  Pattern p = Pattern.compile("(\\.\\s+)(\\w)");
  Matcher m = p.matcher(str);
  StringBuffer sb = new StringBuffer();
  while (m.find())
    m.appendReplacement(sb, "$1");
    sb.append(m.group(2).toUpperCase());
  m.appendTail(sb);
  return sb.toString();
}