/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		CharSequence chSeq = "AND ((:aks_num = -1) OR (aks_num = :aks_num AND ((:brn_num = -1) OR (brn_num = :brn_num))))";
 
    // replaceAll also not working
    //String s = chSeq.replaceAll(":\\([a-z_]*\\)","\\${ $1 \\}$");
 
    Pattern p = Pattern.compile(":(\\w+)");
    Matcher m = p.matcher(chSeq);
 
    while (m.find()) {
         System.out.println("Found value: " + m.group(1) );
      }
	}
}

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