doc2sdl: use POSIX regex functions.

cde/programs/dtdocbook/instant/sgmls.notes

@@ -1,43 +0,0 @@
-#
-# Copyright (c) 1994  
-# Open Software Foundation, Inc. 
-#  
-# Permission is hereby granted to use, copy, modify and freely distribute 
-# the software in this file and its documentation for any purpose without 
-# fee, provided that the above copyright notice appears in all copies and 
-# that both the copyright notice and this permission notice appear in 
-# supporting documentation.  Further, provided that the name of Open 
-# Software Foundation, Inc. ("OSF") not be used in advertising or 
-# publicity pertaining to distribution of the software without prior 
-# written permission from OSF.  OSF makes no representations about the 
-# suitability of this software for any purpose.  It is provided "as is" 
-# without express or implied warranty. 
-#
-
-These are what sgmls feeds us (from the sgmls manpage):
-
-    Commands (the command is the 1st char):
-	(gi				start of element gi
-	)gi				end of element gi
-	-data				data
-	&name				ref to external data entity
-	?pi				processing instruction
-	Aname val			attr name and value
-	Dename name val			same as A, except external entity ename
-	Nnname sysid pubid		def notation nname, ass w/ sysid,pubid
-	Eename typ nname filename	def external data entity ename
-	Iename text			def internal data entity ename
-	Sename filename...		def subdoc entity
-	{ename				start of SGML subdocument entity
-	}ename				end of SGML subdocument entity
-	Llineno [file]			set current line number, filename
-
-    And attributes values can have the form:
-	IMPLIED
-	CDATA data
-	TOKEN token
-	NOTATION nname
-	ENTITY name...
-	ID id
-	IDREF id...
-