To: vim_dev@googlegroups.com
Subject: Patch 7.3.1093
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------

Patch 7.3.1093
Problem:    New regexp engine: When a sub expression is empty \1 skips a
	    character.
Solution:   Make \1 try the current position when the match is emtpy.
Files:	    src/regexp_nfa.c, src/testdir/test64.in, src/testdir/test64.ok


*** ../vim-7.3.1092/src/regexp_nfa.c	2013-06-02 15:55:52.000000000 +0200
--- src/regexp_nfa.c	2013-06-02 16:03:28.000000000 +0200
***************
*** 4435,4445 ****
  		{
  		    if (bytelen == 0)
  		    {
! 			/* empty match always works, add NFA_SKIP with zero to
! 			 * be used next */
! 			addstate_here(thislist, t->state->out, &t->subs,
  								    &listidx);
- 			thislist->t[listidx + 1].count = 0;
  		    }
  		    else if (bytelen <= clen)
  		    {
--- 4435,4444 ----
  		{
  		    if (bytelen == 0)
  		    {
! 			/* empty match always works, output of NFA_SKIP to be
! 			 * used next */
! 			addstate_here(thislist, t->state->out->out, &t->subs,
  								    &listidx);
  		    }
  		    else if (bytelen <= clen)
  		    {
*** ../vim-7.3.1092/src/testdir/test64.in	2013-06-01 19:54:39.000000000 +0200
--- src/testdir/test64.in	2013-06-02 16:02:56.000000000 +0200
***************
*** 361,366 ****
--- 361,367 ----
  :call add(tl, [2, '\(\i\+\) \1', ' abc abc', 'abc abc', 'abc'])
  :call add(tl, [2, '\(\i\+\) \1', 'xgoo goox', 'goo goo', 'goo'])
  :call add(tl, [2, '\(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9', 'xabcddefghiabcddefghix', 'abcddefghiabcddefghi', 'a', 'b', 'c', 'dd', 'e', 'f', 'g', 'h', 'i'])
+ :call add(tl, [2, '\(\d*\)a \1b', ' a b ', 'a b', ''])
  :"
  :"""" Look-behind with limit
  :call add(tl, [2, '<\@<=span.', 'xxspanxx<spanyyy', 'spany'])
*** ../vim-7.3.1092/src/testdir/test64.ok	2013-06-01 19:54:39.000000000 +0200
--- src/testdir/test64.ok	2013-06-02 16:06:44.000000000 +0200
***************
*** 815,820 ****
--- 815,823 ----
  OK 0 - \(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9
  OK 1 - \(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9
  OK 2 - \(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9
+ OK 0 - \(\d*\)a \1b
+ OK 1 - \(\d*\)a \1b
+ OK 2 - \(\d*\)a \1b
  OK 0 - <\@<=span.
  OK 1 - <\@<=span.
  OK 2 - <\@<=span.
*** ../vim-7.3.1092/src/version.c	2013-06-02 15:55:52.000000000 +0200
--- src/version.c	2013-06-02 16:03:55.000000000 +0200
***************
*** 730,731 ****
--- 730,733 ----
  {   /* Add new patch number below this line */
+ /**/
+     1093,
  /**/

-- 
Well, you come from nothing, you go back to nothing...  What have you
lost?  Nothing!
				-- Monty Python: The life of Brian

 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///