diff --git a/IPython/core/completer.py b/IPython/core/completer.py
index 744954e..8cb2345 100644
--- a/IPython/core/completer.py
+++ b/IPython/core/completer.py
@@ -692,10 +692,10 @@ class IPCompleter(Completer):
         try: regexp = self.__funcParamsRegex
         except AttributeError:
             regexp = self.__funcParamsRegex = re.compile(r'''
-                '.*?' |    # single quoted strings or
-                ".*?" |    # double quoted strings or
-                \w+   |    # identifier
-                \S         # other characters
+                '.*?(?<!\\)' |    # single quoted strings or
+                ".*?(?<!\\)" |    # double quoted strings or
+                \w+          |    # identifier
+                \S                # other characters
                 ''', re.VERBOSE | re.DOTALL)
         # 1. find the nearest identifier that comes before an unclosed
         # parenthesis before the cursor
diff --git a/IPython/core/tests/test_completer.py b/IPython/core/tests/test_completer.py
index c0bddd8..c2aa49a 100644
--- a/IPython/core/tests/test_completer.py
+++ b/IPython/core/tests/test_completer.py
@@ -290,6 +290,8 @@ def test_func_kw_completions():
     # Simulate completing with cursor right after b (pos==10):
     s, matches = c.complete(None,'myfunc(1,b)', 10)
     nt.assert_in('b=', matches)
+    s, matches = c.complete(None,'myfunc(a="escaped\\")string",b')
+    nt.assert_in('b=', matches)
 
 
 def test_line_magics():