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  1. import java.util.regex.Pattern;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         String str = "aaBBdf8k3AAadnklA";
  6.         String pattern = "[Aa]";
  7.         System.out.println(
  8.                 Pattern.compile(pattern)
  9.                         .matcher(str)
  10.                         .results()
  11.                         .count());
  12.     }
  13. }
Success #stdin #stdout 0.09s 55532KB
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https://ideone.com/vzfu7c
language:
Java (HotSpot 12)
created:
158 days ago
visibility:
secret

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