git pull http://www.baby-gnu.org/~nebu/archives/gnus/gnus.git dad/match-substitute-replacement-in-posting-style:dad/match-substitute-replacement-in-posting-style

* lisp/gnus-util.el: Define gnus-match-substitute-replacement as an
  alias of match-substitute-replacement or with the definition of
  match-substitute-replacement from subr.el.

* lisp/gnus-msg.el (gnus-configure-posting-styles): Use
  gnus-match-substitute-replacement to replace positional parameters in
  attributes.

* texi/gnus.texi (Posting Styles): Update the documentation: string values
  can now be regular expressions.
---
 lisp/gnus-msg.el  |    6 +++++-
 lisp/gnus-util.el |   23 +++++++++++++++++++++++
 texi/gnus.texi    |   22 ++++++++++++++--------
 3 files changed, 42 insertions(+), 9 deletions(-)

diff --git a/lisp/gnus-msg.el b/lisp/gnus-msg.el
index a7d6711..46cbc75 100644
--- a/lisp/gnus-msg.el
+++ b/lisp/gnus-msg.el
@@ -1891,7 +1891,11 @@ this is a reply."
 	    (setq v
 		  (cond
 		   ((stringp value)
-		    value)
+		    (if (and (stringp match)
+			     (string-match-p "\\\\[&[:digit:]]" value)
+			     (match-beginning 1))
+			(gnus-match-substitute-replacement value nil nil group)
+		      value))
 		   ((or (symbolp value)
 			(functionp value))
 		    (cond ((functionp value)
diff --git a/lisp/gnus-util.el b/lisp/gnus-util.el
index 5bcda97..43ce739 100644
--- a/lisp/gnus-util.el
+++ b/lisp/gnus-util.el
@@ -1982,6 +1982,29 @@ Sizes are in pixels."
 		      (memq elem list))))
     found))
 
+(eval-and-compile
+  (cond
+   ((fboundp 'match-substitute-replacement)
+    (defalias 'gnus-match-substitute-replacement 'match-substitute-replacement))
+   (t
+    (defun gnus-match-substitute-replacement (replacement &optional fixedcase literal string subexp)
+      "Return REPLACEMENT as it will be inserted by `replace-match'.
+In other words, all back-references in the form `\\&' and `\\N'
+are substituted with actual strings matched by the last search.
+Optional FIXEDCASE, LITERAL, STRING and SUBEXP have the same
+meaning as for `replace-match'.
+
+This is the definition of match-substitute-replacement in subr.el from GNU Emacs."
+      (let ((match (match-string 0 string)))
+	(save-match-data
+	  (set-match-data (mapcar (lambda (x)
+				    (if (numberp x)
+					(- x (match-beginning 0))
+				      x))
+				  (match-data t)))
+	  (replace-match replacement fixedcase literal match subexp))))
+    )))
+
 (provide 'gnus-util)
 
 ;;; gnus-util.el ends here
diff --git a/texi/gnus.texi b/texi/gnus.texi
index 0a0f96b..5fea3f0 100644
--- a/texi/gnus.texi
+++ b/texi/gnus.texi
@@ -13428,14 +13428,20 @@ the headers of the article; if the value is @code{nil}, the header
 name will be removed.  If the attribute name is @code{eval}, the form
 is evaluated, and the result is thrown away.
 
-The attribute value can be a string (used verbatim), a function with
-zero arguments (the return value will be used), a variable (its value
-will be used) or a list (it will be @code{eval}ed and the return value
-will be used).  The functions and sexps are called/@code{eval}ed in the
-message buffer that is being set up.  The headers of the current article
-are available through the @code{message-reply-headers} variable, which
-is a vector of the following headers: number subject from date id
-references chars lines xref extra.
+The attribute value can be a string, a function with zero arguments
+(the return value will be used), a variable (its value will be used)
+or a list (it will be @code{eval}ed and the return value will be
+used).  The functions and sexps are called/@code{eval}ed in the
+message buffer that is being set up.  The headers of the current
+article are available through the @code{message-reply-headers}
+variable, which is a vector of the following headers: number subject
+from date id references chars lines xref extra.
+
+In the case of a string value, if the @code{match} is a regular
+expression, a @samp{gnus-match-substitute-replacement} is proceed on
+the value to replace the positional parameters @samp{\@var{n}} by the
+corresponding parenthetical matches (see @xref{Replacing the Text that
+Matched, , Text Replacement, elisp, The Emacs Lisp Reference Manual}.)
 
 @vindex message-reply-headers
 
-- 
1.7.2.3


-- 
Daniel Dehennin
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