From: Nobuyoshi Nakada <nobu@...>
Date: 2008-02-21T02:39:05+09:00
Subject: Re: possible bug in regexp lexing

Hi,

At Thu, 21 Feb 2008 00:29:15 +0900,
Tanaka Akira wrote in [ruby-core:15628]:
> I think there is no reason to change the semantics for
> escaped form even if the character is selected as a
> terminator.  If it is changed, it violates
> "non-alphanumeric character can be escaped by slash".
> So %r?\?? should means single character match for a QUESTION
> MARK.

Am I missing any meta characters?


Index: parse.y
===================================================================
--- parse.y	(revision 15555)
+++ parse.y	(working copy)
@@ -2968,6 +2968,11 @@ tokadd_escape(term)
 	return -1;
 
+      case '(': case ')': case '{': case '}': case '[': case ']':
+      case '?': case '+': case '*': case '|': case '.': case '\\':
+	tokadd('\\');
+	tokadd(c);
+	break;
       default:
-	if (c != '\\' || c != term)
+	if (c != term)
 	    tokadd('\\');
 	tokadd(c);


-- 
Nobu Nakada