import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
String text
= "aaaaaaBccccCCCCd"; //a6B1c4C4d1 Pattern r = Pattern.compile(regex);
Matcher m = r.matcher(text);
while (m.find()) {
m.appendReplacement(sb, m.group(1) + (m.group(2).length()+1));
}
m.appendTail(sb); // append the rest of the contents
}
}
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