diff --git a/7.3.1151 b/7.3.1151
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--- /dev/null
+++ b/7.3.1151
@@ -0,0 +1,187 @@
+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.1151
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.1151
+Problem: New regexp engine: Slow when a look-behind match is followed by a
+ zero-width match.
+Solution: Postpone the look-behind match more often.
+Files: src/regexp_nfa.c
+
+
+*** ../vim-7.3.1150/src/regexp_nfa.c 2013-06-08 22:29:59.000000000 +0200
+--- src/regexp_nfa.c 2013-06-08 23:11:19.000000000 +0200
+***************
+*** 2794,2799 ****
+--- 2794,2800 ----
+ /* unrecognized */
+ return -1;
+ }
++
+ /*
+ * Convert a postfix form into its equivalent NFA.
+ * Return the NFA start state on success, NULL otherwise.
+***************
+*** 3433,3438 ****
+--- 3434,3440 ----
+ static void copy_sub_off __ARGS((regsub_T *to, regsub_T *from));
+ static int sub_equal __ARGS((regsub_T *sub1, regsub_T *sub2));
+ static int has_state_with_pos __ARGS((nfa_list_T *l, nfa_state_T *state, regsubs_T *subs));
++ static int match_follows __ARGS((nfa_state_T *startstate, int depth));
+ static int state_in_list __ARGS((nfa_list_T *l, nfa_state_T *state, regsubs_T *subs));
+ static void addstate __ARGS((nfa_list_T *l, nfa_state_T *state, regsubs_T *subs, int off));
+ static void addstate_here __ARGS((nfa_list_T *l, nfa_state_T *state, regsubs_T *subs, nfa_pim_T *pim, int *ip));
+***************
+*** 3626,3631 ****
+--- 3628,3715 ----
+ }
+
+ /*
++ * Return TRUE if "state" leads to a NFA_MATCH without advancing the input.
++ */
++ static int
++ match_follows(startstate, depth)
++ nfa_state_T *startstate;
++ int depth;
++ {
++ nfa_state_T *state = startstate;
++
++ /* avoid too much recursion */
++ if (depth > 10)
++ return FALSE;
++
++ for (;;)
++ {
++ switch (state->c)
++ {
++ case NFA_MATCH:
++ return TRUE;
++
++ case NFA_SPLIT:
++ return match_follows(state->out, depth + 1)
++ || match_follows(state->out1, depth + 1);
++
++ case NFA_START_INVISIBLE:
++ case NFA_START_INVISIBLE_BEFORE:
++ case NFA_START_INVISIBLE_NEG:
++ case NFA_START_INVISIBLE_BEFORE_NEG:
++ case NFA_COMPOSING:
++ /* skip ahead to next state */
++ state = state->out1->out;
++ break;
++
++ case NFA_ANY:
++ case NFA_IDENT:
++ case NFA_SIDENT:
++ case NFA_KWORD:
++ case NFA_SKWORD:
++ case NFA_FNAME:
++ case NFA_SFNAME:
++ case NFA_PRINT:
++ case NFA_SPRINT:
++ case NFA_WHITE:
++ case NFA_NWHITE:
++ case NFA_DIGIT:
++ case NFA_NDIGIT:
++ case NFA_HEX:
++ case NFA_NHEX:
++ case NFA_OCTAL:
++ case NFA_NOCTAL:
++ case NFA_WORD:
++ case NFA_NWORD:
++ case NFA_HEAD:
++ case NFA_NHEAD:
++ case NFA_ALPHA:
++ case NFA_NALPHA:
++ case NFA_LOWER:
++ case NFA_NLOWER:
++ case NFA_UPPER:
++ case NFA_NUPPER:
++ case NFA_START_COLL:
++ case NFA_START_NEG_COLL:
++ case NFA_NEWL:
++ /* state will advance input */
++ return FALSE;
++
++ default:
++ if (state->c > 0)
++ /* state will advance input */
++ return FALSE;
++
++ /* Others: zero-width or possibly zero-width, might still find
++ * a match at the same position, keep looking. */
++ break;
++ }
++ state = state->out;
++ }
++ return FALSE;
++ }
++
++
++ /*
+ * Return TRUE if "state" is already in list "l".
+ */
+ static int
+***************
+*** 5714,5722 ****
+
+ if (add_state != NULL)
+ {
+! if (t->pim != NULL)
+ {
+- /* postponed invisible match */
+ if (t->pim->result == NFA_PIM_TODO)
+ {
+ #ifdef ENABLE_LOG
+--- 5798,5808 ----
+
+ if (add_state != NULL)
+ {
+! /* Handle the postponed invisible match before advancing to
+! * the next character and for a zero-width match if the match
+! * might end without advancing. */
+! if (t->pim != NULL && (!add_here || match_follows(add_state, 0)))
+ {
+ if (t->pim->result == NFA_PIM_TODO)
+ {
+ #ifdef ENABLE_LOG
+***************
+*** 5773,5779 ****
+ }
+
+ if (add_here)
+! addstate_here(thislist, add_state, &t->subs, NULL, &listidx);
+ else
+ {
+ addstate(nextlist, add_state, &t->subs, add_off);
+--- 5859,5865 ----
+ }
+
+ if (add_here)
+! addstate_here(thislist, add_state, &t->subs, t->pim, &listidx);
+ else
+ {
+ addstate(nextlist, add_state, &t->subs, add_off);
+*** ../vim-7.3.1150/src/version.c 2013-06-08 22:29:59.000000000 +0200
+--- src/version.c 2013-06-08 23:23:53.000000000 +0200
+***************
+*** 730,731 ****
+--- 730,733 ----
+ { /* Add new patch number below this line */
++ /**/
++ 1151,
+ /**/
+
+--
+hundred-and-one symptoms of being an internet addict:
+117. You are more comfortable typing in html.
+
+ /// 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 ///