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    <p>You certainly don't have to type it twice, you can just create a <code>validate</code> function which takes a value and validates it:</p> <pre><code>def validate(argument): return re.match('^SOME_REGEX$', argument) </code></pre> <p>and then write a decorator which calls the <code>validate</code> function as needed:</p> <pre><code>def requires_valid(f): def _inner(request, argument=None): if argument is None: return HttpResponse(content="No argument given", status=400) elif not validate(argument): return HttpResponse(content="Invalid argument", status=400) else: return f(request, argument) return _inner </code></pre> <p>Obviously, I don't know your use case so you might want to move the check for <code>None</code> into <code>validate</code> but the point is, you don't have to repeat the same regex twice.</p> <p>And if you feel like delving into deeper magic and insist on using the same function both as a decorator and a verifier, you might try something like this:</p> <pre><code>def validate(f): if callable(f): def _inner(request, argument=None): if argument is None: return HttpResponse(content="No argument given", status=400) elif not validate(argument): return HttpResponse(content="Invalid argument", status=400) else: return f(request, argument) return _inner else: return re.match('^SOME_REGEX$', f) </code></pre> <p>But I'd advise against this, since you have one function that does two very different things, depending on the type of the parameter. This results in code that is much more difficult to understand. (“You decorate a view with this function which takes a string and returns bool?!”)</p>
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    1. COThis works beautifully, thank you! I didn't know about `if callable()` -- it seems like a very practical thing that I will look into.
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