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Asked: 2026-05-30T12:15:52+00:00

Noticed this urls.py definition in an open source django app. r’^(?P<username>(?!signout|signup|signin)[\.\w]+)/$ How do I

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Noticed this urls.py definition in an open source django app.

r'^(?P<username>(?!signout|signup|signin)[\.\w]+)/$

How do I interprete the (?!signout|signup|signin) component?

I understand the P<username> but I am not sure what (?!signout|signup|signin) is for?

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1 Answer

  1. Editorial Team

    It’s a NOT operator. It matches if the text is not signout, signup, or signin.

    See Python’s re module documentation:

    (?!…)

    Matches if ... doesn’t match next. This is a negative lookahead assertion. For example, Isaac (?!Asimov) will match 'Isaac ' only if it’s not followed by 'Asimov'.

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