Return all GOs which match the user regex pattern.

def get_matching_gos(self, compiled_pattern, **kws):
        """Return all GOs which match the user regex pattern."""
        # kws: prt gos
        matching_gos = []
        obo_dag = self.obo_dag
        prt = kws['prt'] if 'prt' in kws else self.log
        prt.write('\nPATTERN SEARCH: "{P}"\n'.format(P=compiled_pattern.pattern))
        # Only look through GOs in annotation or user-specified GOs
        srchgos = kws['gos'] if 'gos' in kws else self.go2items.keys()
        for go_id in srchgos:
            go_obj = obo_dag.get(go_id, None)
            if go_obj is not None:
                for hdr in self.goa_srch_hdrs:
                    if hdr in go_obj.__dict__:
                        fld_val = getattr(go_obj, hdr)
                        matches = self._search_vals(compiled_pattern, fld_val)
                        for mtch in matches:
                            prt.write("MATCH {go_id}({NAME}) {FLD}: {M}\n".format(
                                FLD=hdr, go_id=go_obj.id, NAME=go_obj.name, M=mtch))
                        if matches:
                            matching_gos.append(go_id)
            else:
                prt.write("**WARNING: {GO} found in annotation is not found in obo\n".format(
                    GO=go_id))
        matching_gos = set(matching_gos)
        # Print summary message
        self._summary_matching_gos(prt, compiled_pattern.pattern, matching_gos, srchgos)
        return matching_gos