Check String for Uppercase letter and find position

Question

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 need to add assigning & deleting. 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:

1. get uppercase letter & positon from string
2. delete it

any help would be much appreciated.

Answer 1

To remove all UPPERCASE letters from a string:

String repl = sir.replaceAll("[A-Z]+", "");

To copy all UPPERCASE letters from a string to another string:

String upper = sir.replaceAll("[^A-Z]+", "");

Answer 2

This will give you all the capital letters in a string:

String inputString;

String outputString = "";

for (int i = 0; i < inputString.length; i++) { c = inputString.charAt(i); ouptutString += Character.isUpperCase(c) ? c + " " : ""; }

Answer 3

You can also try "guava" libriaries. There you can find set of classes for string manipulation. Among them CharMatcher (https://code.google.com/p/guava-libraries/wiki/StringsExplained#CharMatcher)

simple code example can be:

 String string = "ABcdEFgh45";
 String withoutUpperCase = CharMatcher.JAVA_UPPER_CASE.removeFrom(string);
 //returns cdgh45