How to draw this rectangle using tikzpicture environment

Question

I want to draw this kind of rectangle using tikzpicture environment:

a could change to b, c, d, etc.

We should also be able to insert a new line.

If MWE is needed please let me know.

Thanks!

Answer 1

There are already folder symbols on the market that do something like this, e.g. here. That is, if you want to define a new shape, there are answers that give you good start. However, if you want to do it the quick and dirty way, you could do

\documentclass[tikz,border=3.14mm]{standalone}
\begin{document}
\begin{tikzpicture}[fluffy with corner/.style={draw,inner ysep=3mm,inner
xsep=3mm,align=center,
path picture={
\draw ([xshift=3mm]path picture bounding box.north west) 
-- ([yshift=-3mm]path picture bounding box.north west);
\node[anchor=north east,inner sep=2pt] at (path picture bounding box.north east)
{#1};}},fluffy/.style={draw,inner ysep=3mm,inner xsep=3mm,align=center,
path picture={
\node[anchor=north east,inner sep=2pt] at (path picture bounding box.north east) {#1};}}]
\node[fluffy=b] at (0,0){text here}; 
\node[fluffy with corner=a] at (4,0){text here\\ second line\\ third line};
\end{tikzpicture}
\end{document}