/* package whatever; // don't place package name! */
 
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
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String key = "my.key";
		String s = "text...     {#my.key|other_stuff}  {#my.key|new\nstuff}  more\ntext";
		Pattern pattern = Pattern.compile("\\{(#" + Pattern.quote(key) + ")\\|([^}]*)}");
	    Matcher m = pattern.matcher(s);
	    while (m.find()) {
	    	System.out.println("--- Match found ---");
	        System.out.println(m.group(0));
	        System.out.println(m.group(1));
	        System.out.println(m.group(2));
	    }
	}
}

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