Tailor an own compilation-error-regexp-alist.

[william . a . george]

Hi.
I'm having a problem with parsing the errors from my compiler in emacs.
This is an example of the error message from the compiler:
   401:                 rec_p = ReceiveMsg();
E  42: syntax error, expecting statement

Can anyone help me to write an own "compilation-error-regexp-alist"?
Or maybe describe how it should be done?

Thanks in advance.