diff --git a/jsonpath_ng/ext/string.py b/jsonpath_ng/ext/string.py
index 80ed890..efce289 100644
--- a/jsonpath_ng/ext/string.py
+++ b/jsonpath_ng/ext/string.py
@@ -42,10 +42,7 @@ def __init__(self, method=None):
     def find(self, datum):
         datum = DatumInContext.wrap(datum)
         value = self.regex.sub(self.repl, datum.value)
-        if value == datum.value:
-            return []
-        else:
-            return [DatumInContext.wrap(value)]
+        return [DatumInContext.wrap(value)]
 
     def __eq__(self, other):
         return (isinstance(other, Sub) and self.method == other.method)