/usr/share/doc/urlview/examples/sample.urlview is in urlview 0.9-19.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Urlview configuration file.
# man urlview <Man page>
#
# Put this file in: $HOME/.urlview
# Put url_handler.sh in: /usr/bin
#
# You can call 'urlview' while in 'mutt' by pressing the Ctrl b keys.
# Put these macros in your $HOME/.muttrc file.
#
# macro index \cb |urlview\n
# macro pager \cb |urlview\n
#
# You can call 'urlview' while in 'tin' by pressing | then a for article,
# put urlview as the pipe command.
#
# Regular expression to use to match URLs.
#REGEXP (((http|https|ftp|gopher)|mailto):(//)?[^ >"\t]*|www\.[-a-z0-9.]+)[^ .,;\t>">\):]
REGEXP (((http|https|ftp|gopher)|mailto)[.:][^ >"\t]*|www\.[-a-z0-9.]+)[^ .,;\t>">\):]
# Command to invoke for selected URL. Use lynx, netscape, or url_handler.sh
# shell script. Alternatively, you can leave COMMAND unset and set the BROWSER
# environment variable instead.
#COMMAND lynx %s
#COMMAND netscape -remote 'openURL(%s)'
COMMAND url_handler.sh
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