Check String for Uppercase letter and find position

Check String for Uppercase letter and find position

I need to check if in my String "sir" i have some uppercase letters, if
so, i need to assign the value of that letter to another string and then
to delete the letter. my first part looks like this:
Pattern p = Pattern.compile("[^A-Z]", Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(sir);
boolean b = m.find();
so that i check if there is any uppercase letter then i assign & delete. i
am not sure if this works. also i found another way:
StringTokenizer stringTokenizer = new StringTokenizer(sir);
while (stringTokenizer.hasMoreTokens()) {
String a = stringTokenizer.nextToken();
if(a.equals(a.toUpperCase())) {
upper = a;
}
}
upper returns null everytime, even though sir = cL
does anyone know a way to:
get uppercase letter & positon from string
delete it
any help would be much appreciated.