+orig_source_ext_re = r"orig(?:-.+)?\.tar\.(?:gz|bz2)"
+re_orig_source_ext = re.compile(orig_source_ext_re + "$")
+re_source_ext = re.compile("(" + orig_source_ext_re + r"|debian\.tar\.(?:gz|bz2)|diff\.gz|tar\.(?:gz|bz2)|dsc)$")
+re_issource = re.compile(r"(.+)_(.+?)\." + re_source_ext.pattern)
+re_is_orig_source = re.compile (r"(.+)_(.+?)\.orig(?:-.+)?\.tar\.(?:gz|bz2)$")
+#re_is_orig_source = re.compile (r"(.+)_(.+?)\.(?:orig\.)?tar\.(?:gz|bz2)$")