Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:

The problem is the "(?:[^<]+|<(?!/head>))*?".

If I simplify it a little I get "(?:[^<]+)*?", which is a repeat within a 
repeat.

There are many ways in which it could match, and if what follows fails to match 
(it doesn't because there's no "<style>" in the target string, as  Aldwin 
pointed out), it'll try them all, which can take a long time.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37327>
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