Fixing doctest EXCLUDES in iptest on win32.

The regular expressions we were using on win32 were not matching.  The
trick is to construct the regular expression with double \\ like this::

    re.compile('foo\\\\bar')

Arggg!!

IPython/testing/iptest.py

@@ -30,6 +30,7 b' import warnings'
 import nose.plugins.builtin
 from nose.core import TestProgram
 
+from IPython.platutils import find_cmd
 from IPython.testing.plugin.ipdoctest import IPythonDoctest
 
 pjoin = path.join
@@ -43,6 +44,7 b' pjoin = path.join'
 # modules, since this means untested code.  As the testing machinery
 # solidifies, this list should eventually become empty.
 EXCLUDE = [pjoin('IPython', 'external'),
+            # This skip is duplicated below XXX
            pjoin('IPython', 'platutils_win32'),
            pjoin('IPython', 'frontend', 'cocoa'),
            pjoin('IPython', 'frontend', 'process', 'winprocess.py'),
@@ -50,12 +52,28 b" EXCLUDE = [pjoin('IPython', 'external'),"
            pjoin('IPython', 'Gnuplot'),
            pjoin('IPython', 'Extensions', 'ipy_'),
            pjoin('IPython', 'Extensions', 'clearcmd'),
-           pjoin('IPython', 'Extensions', 'PhysicalQIn'),
+           pjoin('IPython', 'Extensions', 'PhysicalQInteractive'),
            pjoin('IPython', 'Extensions', 'scitedirector'),
            pjoin('IPython', 'Extensions', 'numeric_formats'),
            pjoin('IPython', 'testing', 'attic'),
            ]
 
+try:
+    import wx
+except ImportError:
+    EXCLUDE.append(pjoin('IPython', 'Extensions', 'igrid'))
+
+try:
+    import _curses
+except ImportError:
+    EXCLUDE.append(pjoin('IPython', 'Extensions', 'ibrowse'))
+
+
+# This is needed for the reg-exp to match on win32 in the ipdoctest plugin.
+if sys.platform == 'win32':
+    EXCLUDE = [s.replace('\\','\\\\') for s in EXCLUDE]
+
+
 #-----------------------------------------------------------------------------
 # Functions and classes
 #-----------------------------------------------------------------------------
@@ -125,7 +143,7 b' class IPTester(object):'
         if runner == 'iptest':
             self.runner = ['iptest','-v']
         else:
-            self.runner = ['trial']
+            self.runner = [find_cmd('trial')]
         if params is None:
             params = []
         if isinstance(params,str):