diff --git a/parsley/decorators.py b/parsley/decorators.py
index 292b341..3417729 100644
--- a/parsley/decorators.py
+++ b/parsley/decorators.py
@@ -23,9 +23,8 @@ def new_init(self, *args, **kwargs):
             if isinstance(field, forms.FloatField):
                 field.widget.attrs.update({"data-type": "number"})
             if isinstance(field, forms.RegexField):
-                pattern = field.regex.pattern
-                field.widget.attrs.update({"data-regexp": pattern})
-                if pattern.flags & re.IGNORECASE:
+                field.widget.attrs.update({"data-regexp": field.regex.pattern})
+                if field.regex.flags & re.IGNORECASE:
                     field.widget.attrs.update({"data-regexp-flag": "i"})
             if hasattr(field, "max_length") and field.max_length:
                 field.widget.attrs.update({"data-maxlength": field.max_length})