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Asked: 2026-05-14T06:00:43+00:00

http://docs.djangoproject.com/en/dev/intro/tutorial03/ I was at the step Decoupling the URLconfs where the tutorial illustrates how

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http://docs.djangoproject.com/en/dev/intro/tutorial03/

I was at the step Decoupling the URLconfs where the tutorial illustrates how to decouple urls.py. On doing exactly what it says, i get the following error-

error at /polls/1/
nothing to repeat
Request Method: GET
Request URL:    http://localhost:8000/polls/1/
Exception Type: error
Exception Value:    
nothing to repeat
Exception Location: C:\jython2.5.1\Lib\re.py in _compile, line 241
Python Executable:  C:\jython2.5.1\jython.bat
Python Version: 2.5.1
Python Path:    ['E:\\Programming\\Project\\django_app\\mysite', 'C:\\jython2.5.1\\Lib\\site-packages\\setuptools-0.6c11-py2.5.egg', 'C:\\jython2.5.1\\Lib', '__classpath__', '__pyclasspath__/', 'C:\\jython2.5.1\\Lib\\site-packages']
Server time:    Mon, 12 Apr 2010 12:02:56 +0530
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1 Answer

  1. Editorial Team

    Check your regex syntax. In particular, see if you are missing an opening parenthesis before a ? towards the beginning of the pattern, as in

    r'^?P<poll_id>\d+)/$'
#  ^ note the missing parenthesis

    The above should read

    r'^(?P<poll_id>\d+)/$'

    instead.

    (An explanation: “nothing to repeat” is a regex error which arises due to an ? regex operator occurring where it is not preceded by something which it can sensibly attach to. The ? in (?P<...>...) is treated specially, but if you forget the opening parenthesis, the regex engine will treat ? in the regular way, which makes no sense right after ^.)

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