diff --git a/common/python/nomadcore/simple_parser.py b/common/python/nomadcore/simple_parser.py
index cad9851472f9f547a4b48541febe700cccafd743..bba15465022af09df3fd5d66ee3210bede0082fb 100644
--- a/common/python/nomadcore/simple_parser.py
+++ b/common/python/nomadcore/simple_parser.py
@@ -706,7 +706,7 @@ class CompiledMatcher(object):
             # overall span of match, and spans of group captures
             'span': [],
             # capture group names
-            'group': [],
+            'matcherGroup': [],
         }
         if match:
             span = match.span()
@@ -716,7 +716,7 @@ class CompiledMatcher(object):
                 result['match'] = 1 # partial match
             if self.matcher.coverageIgnore: # matcher is local coverageIgnore
                 result['coverageIgnore'] = 1
-            result['group'] = self.groupname[targetStartEnd]
+            result['matcherGroup'] = self.groupname[targetStartEnd]
             # Forward compatibility with 'regex' or 're2', which support
             # multiple captures per group:
             #   span: list of lists of tuples: [groups, captures, 2]