https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=180381

Yuri Pankov <yur...@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |yur...@freebsd.org

--- Comment #4 from Yuri Pankov <yur...@freebsd.org> ---
Yes, that is expected behavior, from pgrep(1) man page:

     If any pattern operands are specified, they are used as extended regular
     expressions to match the command name or full argument list of each
     process.

You'll have to escape all characters that have special meaning in regular
expressions, e.g.:

$ pgrep -lf a\\+\\+
63750 ./a++

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