diff --git a/jenkins_jobs/formatter.py b/jenkins_jobs/formatter.py
index a79729e9a..9b1d0647e 100644
--- a/jenkins_jobs/formatter.py
+++ b/jenkins_jobs/formatter.py
@@ -84,7 +84,7 @@ class CustomFormatter(Formatter):
     _expr = """
         (?<!{){({{)*                # non-pair opening {
         (?:obj:)?                   # obj:
-        (?P<key>[\w\-]+)            # key
+        (?P<key>\w+)                # key
         (?:\|(?P<default>[^}]*))?   # default fallback
         }(}})*(?!})                 # non-pair closing }
     """