This contains a fix for a speed issue with the urlize filter. urlize is likely to be called on untrusted user input. For certain inputs some of the regular expressions used to parse the text could take a very long time due to backtracking. As part of the fix, the email matching became slightly stricter. The various speedups apply to urlize in general, not just the specific input cases.
Improve the speed of the urlize filter by reducing regex
backtracking. Email matching requires a word character at the start
of the domain part, and only word characters in the TLD. 1343
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