Reproducible bug summary

1. enable Allow Hyphens in Short URLs plugin
2. create short URL containing hyphen(s)
   e.g. sho.rt/a-b
3. deactivate plugin;
   • hyphens not shown in Short URL column in admin/index.php
     i.e. sho.rt/ab shown where sho.rt/a-b used to be
   • neither sho.rt/a-b nor sho.rt/ab successfully redirect to target
   • trying to delete the link results in the error
     something wrong happened while deleting :/

Technical details

• YOURLS version: 1.7.2
• PHP version: 7.1.8
• Ubuntu 16.04.3 LTS w/ Apache 2.4.27