Index: gc_core/py/lang_core/gc_engine.py
==================================================================
--- gc_core/py/lang_core/gc_engine.py
+++ gc_core/py/lang_core/gc_engine.py
@@ -695,14 +695,27 @@
                     #print("value regex matching: ", sRegex)
                     yield dGraph[dNode["<re_value>"][sRegex]]
         # regex morph arcs
         if "<re_morph>" in dNode:
             for sRegex in dNode["<re_morph>"]:
-                for sMorph in _oSpellChecker.getMorph(dToken["sValue"]):
-                    if re.search(sRegex, sMorph):
-                        #print("morph regex matching: ", sRegex)
+                if "¬" not in sRegex:
+                    # no anti-pattern
+                    if any(re.search(sRegex, sMorph)  for sMorph in _oSpellChecker.getMorph(dToken["sValue"])):
                         yield dGraph[dNode["<re_morph>"][sRegex]]
+                else:
+                    # there is an anti-pattern
+                    sPattern, sNegPattern = sRegex.split("¬", 1)
+                    if sNegPattern == "*":
+                        # all morphologies must match with <sPattern>
+                        if all(re.search(sPattern, sMorph)  for sMorph in _oSpellChecker.getMorph(dToken["sValue"])):
+                            yield dGraph[dNode["<re_morph>"][sRegex]]
+                    else:
+                        if sNegPattern and any(re.search(sNegPattern, sMorph)  for sMorph in _oSpellChecker.getMorph(dToken["sValue"])):
+                            continue
+                        if any(re.search(sPattern, sMorph)  for sMorph in _oSpellChecker.getMorph(dToken["sValue"])):
+                            yield dGraph[dNode["<re_morph>"][sRegex]]
+
 
     def parse (self, dPriority, sCountry="${country_default}", dOptions=None, bShowRuleId=False, bDebug=False, bContext=False):
         dErr = {}
         dPriority = {}  # Key = position; value = priority
         dOpt = _dOptions  if not dOptions  else dOptions

Index: gc_lang/fr/rules_graph.grx
==================================================================
--- gc_lang/fr/rules_graph.grx
+++ gc_lang/fr/rules_graph.grx
@@ -68,9 +68,9 @@
 
 TEST: Ça me fait {{plaisirs}}.
 
 
 __test__
-    je  ~préf[éè]r  [que|qu’]  @(?::Os|:M)  @:I
+    je  ~préf[éè]r  [que|qu’]  @(?::Os|:M)¬:X  @:I
         <<- morph(\1, ":V", False) and morphex(\4, ":Os|:M", ":X") -5>> SUBJONCTIF                  # SUBJONCTIF.
 
 TEST: je préférerais qu’Isabelle {{est}} partie.