Vim's errorformat `ignore the rest of the line'

Question

I am working with a program which check rules violation in C programs, the output line are like this one:
r219_n1.c:4:1: violated rule r11 (Avoid implicit conversion between int of different sizes); PP #1 (begin)
and I'd like to use the quickfix of Vim.
in my vimrc I put:
map <Leader>e :set makeprg=rchecker\ %<cr>
\:set errorformat=%f:%l:%c:\ violated\ rule\ r%n\ %m<cr>
so when I am ready to check (after compiling) I just press `,e' and :make again.
It works, but I'd like to keep only the message between () and not the noise after. So I'd need something like:
map <Leader>e :set makeprg=rchecker\ %<cr>
\:set errorformat=%f:%l:%c:\ violated\ rule\ r%n\ (%m)[[[just ignore the rest of the line!!!]]]<cr>
but I can not find a way to just ignore a piece of output! I can not use %s otherwise vim tries to use the matched string to seek the error...
Do anyone knows how to obtain this?
thanks

Answer 1

Thank' for the links.
I reply a simplified code.
*** definition of mainClass I tried
public class mainClass () {
public static void main( String [] args )
IgnoreCode ignorecode = new IgnoreCode ();
classX x = new classX ();
/* associate x to ignorecode to allowe to call the doPrint
method of x object in the doprint method of ignorecode object */
ignorecode.associate(x);
/* associate ignorecode to x to allowe to call the doPrint
method of ignorecode object when ......an event occur in the
swing interface shown by the show method of x object */
x.associate(ignorecode);
x.show (); /* see definition of classX under
*** definition of IgnoreCode class
public class IgnoreCode extends SuperClass
public void doPrint(){
System.out.println( "In do" );
x.doPrint();
System.out.println( "In do" );
*** definition of SuperClass class
public abstract class SuperClass {
protected classX x;
public void associate(classX x1){
x = x1;
*** definition of classX class
public class classX {
protected IgnoreCode ignorecode;
public void doPrint() {
System.out.println( "x In do" );
public void associate( IgnoreCode ignorecode1 ){
ignorecode = ignorecode1;
public void show () {
/* swing interface */
}