diff --git a/libmproxy/flow.py b/libmproxy/flow.py
index 3078c4e09..8267ff43f 100644
--- a/libmproxy/flow.py
+++ b/libmproxy/flow.py
@@ -323,16 +323,16 @@ class Flow:
                 self.response.ack()
             self.intercepting = False
 
-    def replace(self, pattern, repl, count=0, flags=0):
+    def replace(self, pattern, repl, *args, **kwargs):
         """
             Replaces a regular expression pattern with repl in all parts of the
-            flow . Returns the number of replacements made. 
+            flow . Returns the number of replacements made.
         """
-        c = self.request.replace(pattern, repl, count, flags)
+        c = self.request.replace(pattern, repl, *args, **kwargs)
         if self.response:
-            c += self.response.replace(pattern, repl, count, flags)
+            c += self.response.replace(pattern, repl, *args, **kwargs)
         if self.error:
-            c += self.error.replace(pattern, repl, count, flags)
+            c += self.error.replace(pattern, repl, *args, **kwargs)
         return c
 
 
diff --git a/libmproxy/proxy.py b/libmproxy/proxy.py
index 8d2888a48..e765d8b64 100644
--- a/libmproxy/proxy.py
+++ b/libmproxy/proxy.py
@@ -280,16 +280,16 @@ class Request(controller.Msg):
         else:
             return self.FMT_PROXY % (self.method, self.scheme, self.host, self.port, self.path, str(headers), content)
 
-    def replace(self, pattern, repl, count=0, flags=0):
+    def replace(self, pattern, repl, *args, **kwargs):
         """
             Replaces a regular expression pattern with repl in both the headers
             and the body of the request. Returns the number of replacements
-            made. 
+            made.
         """
-        self.content, c = re.subn(pattern, repl, self.content, count, flags)
-        self.path, pc = re.subn(pattern, repl, self.path, count, flags)
+        self.content, c = re.subn(pattern, repl, self.content, *args, **kwargs)
+        self.path, pc = re.subn(pattern, repl, self.path, *args, **kwargs)
         c += pc
-        c += self.headers.replace(pattern, repl, count, flags)
+        c += self.headers.replace(pattern, repl, *args, **kwargs)
         return c
 
 
@@ -418,14 +418,14 @@ class Response(controller.Msg):
         data = (proto, str(headers), content)
         return self.FMT%data
 
-    def replace(self, pattern, repl, count=0, flags=0):
+    def replace(self, pattern, repl, *args, **kwargs):
         """
             Replaces a regular expression pattern with repl in both the headers
             and the body of the response. Returns the number of replacements
-            made. 
+            made.
         """
-        self.content, c = re.subn(pattern, repl, self.content, count, flags)
-        c += self.headers.replace(pattern, repl, count, flags)
+        self.content, c = re.subn(pattern, repl, self.content, *args, **kwargs)
+        c += self.headers.replace(pattern, repl, *args, **kwargs)
         return c
 
 
@@ -497,13 +497,13 @@ class Error(controller.Msg):
     def __eq__(self, other):
         return self.get_state() == other.get_state()
 
-    def replace(self, pattern, repl, count=0, flags=0):
+    def replace(self, pattern, repl, *args, **kwargs):
         """
             Replaces a regular expression pattern with repl in both the headers
             and the body of the request. Returns the number of replacements
-            made. 
+            made.
         """
-        self.msg, c = re.subn(pattern, repl, self.msg, count, flags)
+        self.msg, c = re.subn(pattern, repl, self.msg, *args, **kwargs)
         return c
 
 
diff --git a/libmproxy/utils.py b/libmproxy/utils.py
index 9ac9c0b8f..3dbeb620b 100644
--- a/libmproxy/utils.py
+++ b/libmproxy/utils.py
@@ -1,15 +1,15 @@
 # Copyright (C) 2010  Aldo Cortesi
-# 
+#
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
-# 
+#
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
-# 
+#
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 import re, os, subprocess, datetime, textwrap, errno
@@ -67,7 +67,7 @@ def cleanBin(s):
             if i not in "\n\r\t":
                 parts.append(".")
     return "".join(parts)
-    
+
 
 TAG = r"""
         <\s*
@@ -279,16 +279,16 @@ class Headers:
                     ret.append([name, value])
         self.lst = ret
 
-    def replace(self, pattern, repl, count=0, flags=0):
+    def replace(self, pattern, repl, *args, **kwargs):
         """
             Replaces a regular expression pattern with repl in both header keys
-            and values. Returns the number of replacements made. 
+            and values. Returns the number of replacements made.
         """
         nlst, count = [], 0
         for i in self.lst:
-            k, c = re.subn(pattern, repl, i[0], count, flags)
+            k, c = re.subn(pattern, repl, i[0], *args, **kwargs)
             count += c
-            v, c = re.subn(pattern, repl, i[1], count, flags)
+            v, c = re.subn(pattern, repl, i[1], *args, **kwargs)
             count += c
             nlst.append([k, v])
         self.lst = nlst
diff --git a/test/test_proxy.py b/test/test_proxy.py
index dacdbcc3d..ffd29a739 100644
--- a/test/test_proxy.py
+++ b/test/test_proxy.py
@@ -133,7 +133,7 @@ class uRequest(libpry.AutoTree):
         r.path = "path/foo"
         r.headers["Foo"] = ["fOo"]
         r.content = "afoob"
-        assert r.replace("foo", "boo", flags=re.I) == 4
+        assert r.replace("foo(?i)", "boo") == 4
         assert r.path == "path/boo"
         assert not "foo" in r.content
         assert r.headers["boo"] == ["boo"]
@@ -199,7 +199,7 @@ class uResponse(libpry.AutoTree):
         r = tutils.tresp()
         r.headers["Foo"] = ["fOo"]
         r.content = "afoob"
-        assert r.replace("foo", "boo", flags=re.I) == 3
+        assert r.replace("foo(?i)", "boo") == 3
         assert not "foo" in r.content
         assert r.headers["boo"] == ["boo"]