--- a/pyrect/converter.py	Tue Dec 14 15:02:25 2010 +0900
+++ b/pyrect/converter.py	Tue Dec 21 00:44:53 2010 +0900
@@ -18,14 +18,21 @@
     psr.add_option("--from-snfa", action="store_true", dest="snfa", default=False, help="translate from SuffixNFA")
     psr.add_option("--from-sdfa", action="store_true", dest="sdfa", default=False, help="translate from SuffixDFA")
     psr.add_option("--from-trie", action="store_true", dest="trie", default=False, help="translate from Trie")
+    psr.add_option("--regex", action="store", type="string", dest="regex", default=False, help="regexp file", metavar="FILE")
     psr.add_option("-o", action="store", type="string", dest="output", default=False, help="output file", metavar="FILE")
     psr.add_option("-O", action="store_true", dest="optimize", default=False, help="do optimization (only in llvm).")
     psr.add_option("-g", action="store_true", dest="debug", default=False, help="embed debug info")
     (opts, args) = psr.parse_args(sys.argv)
     if len(args) == 1:
-        psr.print_help()
-        exit()
-    reg = Regexp(args[1])
+        if opts.regex:
+            file = open(opts.regex, 'r')
+            reg = Regexp(file.read().rstrip())
+            file.close()
+        else:
+            psr.print_help()
+            exit()
+    else:
+        reg = Regexp(args[1])
     if not opts.output:
         output = sys.stdout
     else: