Untitled

\documentclass{article}
\makeatletter
% #1-thickness #2-length #3-vertical position
\newcommand\brule[3][.4\p@]{\leavevmode
  {\setlength\@tempdima{#2}\setlength\@tempdimb{#1}\setlength\@tempdimc{#3}%
   \@tempcnta=\fpeval{ceil(\@tempdima/5pt)}
   \kern\z@
   \loop\ifnum\@tempcnta>\z@
     \vrule \@width 5pt \@height \dimexpr\@tempdimc+\@tempdimb\relax \@depth \dimexpr-\@tempdimc\relax \hskip\z@skip
     \advance\@tempcnta\m@ne
   \repeat \unskip
}}
\makeatother
\begin{document}

Hello AAAAAA \brule{15cm}{2pt} BBBBBB!

\bigskip

Hello AAAAAA \brule{40cm}{-3pt} BBBBBB!

\end{document}