diff --git a/scrapy/utils/curl.py b/scrapy/utils/curl.py
index 5e095f933..b873d2bdf 100644
--- a/scrapy/utils/curl.py
+++ b/scrapy/utils/curl.py
@@ -11,7 +11,7 @@ from w3lib.http import basic_auth_header
 class DataAction(argparse.Action):
     def __call__(self, parser, namespace, values, option_string=None):
         value = str(values).encode("utf-8").decode("utf-8")
-        if items := re.findall(r"{.+}", value):
+        if items := re.findall(r"\$(.+)", value):
             value = items[0]
 
         setattr(namespace, self.dest, value)