Regular Expression for UpperCase Letters In A String

Question

For the life of me, I can\'t figure out why this regular expression is not working. It should find upper case letters in the given string and give me the count. Any ideas are we

Answer 1

This should do what you're after,

@Test
public void testCountTheNumberOfUpperCaseCharacters() {
  String testStr = "abcdefghijkTYYtyyQ";
  String regEx = "[A-Z]+";
  Pattern pattern = Pattern.compile(regEx);
  Matcher matcher = pattern.matcher(testStr);
  int count = 0;
  while (matcher.find()) {
    count+=matcher.group(0).length();
  }
  System.out.printf("Found %d, of capital letters in %s%n", count, testStr);
}

Answer 2

You can also use Java Regex, for example:

.+[\p{javaUpperCase}].+ 

An example from my work project: