There is an error in the regex on line 598 of file papercite.php with recent versions of PHP (using 7.4 myself).
In particular, the dash in a regex was previously not interpreted as an error (which could be ambiguously interpreted as a range), but with later versions of PHP this seems to have changed (see this SO question).
In particular, part of the regex was [\w-:_] which should just be changed to [-\w:_]. After changing this, everything works again. You can manually adjust this in your plugins directory. Perhaps this can also be addressed upstream to solve the problem in a next release.
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This reply was modified 5 years, 8 months ago by vtraag.
