Index: doc/syntax.txt
==================================================================
--- doc/syntax.txt
+++ doc/syntax.txt
@@ -202,10 +202,31 @@
 
 Example. Back reference in messages.
 
     (fooo) bar <<- ->> foo      # “\1” should be:
 
+
+### Group positioning codes for JavaScript:
+
+There is no way in JavaScript to know where a captured group starts and ends. To avoid misplacement, regex rules may specify group positioning codes which indicate to the grammar checker where is the position of the captured groups.
+
+A group positioning code always begins by `@@`. If there is several codes, they are separated by a comma `,`.
+
+Other codes:
+
+    0 1 2 3 ... n       left boundary position from left
+    -1 -2 -2 ... -n     right boundary position from right
+    $                   extreme right boundary
+    w                   somewhere with word boundaries
+    *                   something somewhere
+    **                  something somewhere after previous group
+
+Examples:
+
+    ([A-ZÉÈÂÎ][\w-]+) [A-ZÉÈÂ]([.]) ([A-ZÉÈÂ][\w-]+)  @@0,*,$
+    " ([?!;])"  @@1
+
 
 ### Pattern matching
 
 Repeating pattern matching of a single rule continues after the previous matching, so instead of general multiword patterns, like
 

Index: gc_lang/fr/rules.grx
==================================================================
--- gc_lang/fr/rules.grx
+++ gc_lang/fr/rules.grx
@@ -17,34 +17,10 @@
 #   GNU General Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License
 #   along with Grammalecte.  If not, see <http://www.gnu.org/licenses/>
 #
-
-# DOCUMENTATION
-
-# [++] : séparateur des règles pour le paragraphe et des règles pour la phrase.
-
-# Types d’action:
-#   ->> erreur
-#   ~>> préprocesseur de texte
-#   =>> désambiguïsateur
-
-# RÈGLES PAR EXPRESSIONS RÉGULIÈRES
-# Expressions régulières en Python : http://docs.python.org/library/re.html
-# Groups positioning code for JavaScript:
-# Always begins by @@
-#   0 ... n         left boundary position from left
-#   $               right boundary
-#   w               word boundaries
-#   *               something somewhere
-#   **              something somewhere after previous group
-#   >x:_            within group x, _ is group position code within group x
-
-# Fin d’interprétation du fichier avec une ligne commençant par #END
-
-
 
 # ERREURS COURANTES
 # http://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Fautes_d%27orthographe/Courantes