Make completer recognize escaped quotes in strings.

IPython/core/completer.py

@@ -692,10 +692,10 b' 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

IPython/core/tests/test_completer.py

@@ -290,6 +290,8 b' 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():