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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Syntax properties and \_>
Date: Mon, 20 Dec 2004 05:56:54 -0500
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Does this patch fix your problem?

*** regex.c	06 Dec 2004 00:42:45 -0500	1.198
--- regex.c	20 Dec 2004 04:49:54 -0500	
***************
*** 5860,5866 ****
  		  PREFETCH_NOLIMIT ();
  		  c2 = RE_STRING_CHAR (d, dend - d);
  #ifdef emacs
! 		  UPDATE_SYNTAX_TABLE_FORWARD (charpos);
  #endif
  		  s2 = SYNTAX (c2);
  
--- 5860,5866 ----
  		  PREFETCH_NOLIMIT ();
  		  c2 = RE_STRING_CHAR (d, dend - d);
  #ifdef emacs
! 		  UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1);
  #endif
  		  s2 = SYNTAX (c2);
  
***************
*** 5947,5953 ****
  		  PREFETCH_NOLIMIT ();
  		  c2 = RE_STRING_CHAR (d, dend - d);
  #ifdef emacs
! 		  UPDATE_SYNTAX_TABLE_FORWARD (charpos);
  #endif
  		  s2 = SYNTAX (c2);
  
--- 5947,5953 ----
  		  PREFETCH_NOLIMIT ();
  		  c2 = RE_STRING_CHAR (d, dend - d);
  #ifdef emacs
! 		  UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1);
  #endif
  		  s2 = SYNTAX (c2);