move regex definition for readability

IPython/core/debugger.py

@@ -41,7 +41,6 b' from IPython.core.excolors import exception_colors'
 from IPython.testing.skipdoctest import skip_doctest
 
 
-RGX_EXTRA_INDENT = re.compile('(?<=\n)\s+')
 
 
 prompt = 'ipdb> '
@@ -179,6 +178,9 b' class Tracer(object):'
         self.debugger.set_trace(sys._getframe().f_back)
 
 
+RGX_EXTRA_INDENT = re.compile('(?<=\n)\s+')
+
+
 def strip_indentation(multiline_string):
     return RGX_EXTRA_INDENT.sub('', multiline_string)