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diff --git a/re.c b/re.c
index 6cdfe85..acf6cb5 100644
--- a/re.c
+++ b/re.c
@@ -89,6 +89,25 @@ regexp_finalize_imp(void *rcv, SEL sel)
     }
 }
 
+static bool
+is_octal_literal(UChar *chars, long length)
+{
+    bool ret = false;
+    int i;
+    for(i = 0; i < length; i++) {
+	UChar c = chars[i];
+	if (!rb_isdigit(c)) {
+	    break;
+	}
+	if (c >= '8') {
+	    return false;
+	}
+	ret = true;
+    }
+
+    return ret && i >= 2;
+}
+
 // Work around ICU limitations.
 static void
 sanitize_regexp_string(UChar **chars_p, long *chars_len_p)
@@ -142,7 +161,20 @@ sanitize_regexp_string(UChar **chars_p, long *chars_len_p)
 		break;
 	    }
 	    UChar c = chars[i];
-	    if (c >= '0' && c <= '9') {
+	    if (rb_isdigit(c)) {
+		if (is_octal_literal(&chars[i], chars_len)) {
+		    // Handling for octal literals.
+		    if (c > '0') {
+			// ICU need the string as octal literal \0ooo format.
+			chars = (UChar *)xrealloc(chars, sizeof(UChar) * (chars_len + 1));
+			memmove(&chars[i + 1], &chars[i],
+				sizeof(UChar) * (chars_len - i));
+			chars[i] = '0';
+			chars_len++;
+		    }
+		    break;
+		}
+
 		assert(n < 10);
 		buf[n++] = (char)c;
 	    }

time = "Wed, 18 Apr 2012 05:36:28 GMT"
p time =~ /[\x00-\x1F]/ # hex
p time =~ /[\00-\037]/ # oct

str = "abcdefg"
str =~ /([\0141-\143]+)/
p $1