diff --git a/packages/mermaid/src/diagrams/gantt/parser/gantt.jison b/packages/mermaid/src/diagrams/gantt/parser/gantt.jison
index 068a6fb92..1d213834e 100644
--- a/packages/mermaid/src/diagrams/gantt/parser/gantt.jison
+++ b/packages/mermaid/src/diagrams/gantt/parser/gantt.jison
@@ -86,13 +86,13 @@ that id.
 "includes"\s[^#\n;]+            return 'includes';
 "excludes"\s[^#\n;]+            return 'excludes';
 "todayMarker"\s[^\n;]+          return 'todayMarker';
-.*weekday\s+monday[^\n]*        return 'weekday_monday'
-.*weekday\s+tuesday[^\n]*       return 'weekday_tuesday'
-.*weekday\s+wednesday[^\n]*     return 'weekday_wednesday'
-.*weekday\s+thursday[^\n]*      return 'weekday_thursday'
-.*weekday\s+friday[^\n]*        return 'weekday_friday'
-.*weekday\s+saturday[^\n]*      return 'weekday_saturday'
-.*weekday\s+sunday[^\n]*        return 'weekday_sunday'
+.*weekday\s+monday[^\n]+        return 'weekday_monday'
+.*weekday\s+tuesday[^\n]+       return 'weekday_tuesday'
+.*weekday\s+wednesday[^\n]+     return 'weekday_wednesday'
+.*weekday\s+thursday[^\n]+      return 'weekday_thursday'
+.*weekday\s+friday[^\n]+        return 'weekday_friday'
+.*weekday\s+saturday[^\n]+      return 'weekday_saturday'
+.*weekday\s+sunday[^\n]+        return 'weekday_sunday'
 \d\d\d\d"-"\d\d"-"\d\d          return 'date';
 "title"\s[^#\n;]+               return 'title';
 "accDescription"\s[^#\n;]+      return 'accDescription'