tikz - Relative alignment issue

Question

I have the following MNWE:

\documentclass[tikz]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{shapes.geometric, arrows}

\tikzstyle{process} = [rectangle, minimum height=1cm, text centered, draw=black, fill=orange!30]
\tikzstyle{arrow} = [thick,->,>=stealth]

\begin{document}

\begin{tikzpicture}[node distance=1cm]

\node (start) [process] {1};
\node (node2r) [process, below right=of start] {2r};
\node (node3r) [process, below=of node2r] {3r};
\node (node4r) [process, below=of node3r] {4r};
\node (node2l) [process, below left=of start] {2l};
\node (node4l) [process, below=of node2l, left=of node4r] {4l};
\node (end) [process, below left=of node4r] {4};

\draw [arrow] (start) -| (node2r);
\draw [arrow] (start) -| (node2l);
\draw [arrow] (node2l) -- (node4l);
\draw [arrow] (node2r) -- (node3r);
\draw [arrow] (node3r) -- (node4r);
\draw [arrow] (node4r) |- (end);
\draw [arrow] (node4l) |- (end);

\end{tikzpicture}

\end{document}

This generates the following output.

How do I adjust the code so that 4l aligns with both 2l (horizontally) and 4r (vertically)?

---

Bonus question: How do I ensure that 1 and 5 aligns vertically? (Occurs if the rectangles differ in width)

Answer 1

You can use the syntax at (coordinate|-coordinate) for example. By the way, I switched to \tikzset because \tikzstyle is deprecated (even though it may be still supported).

Output

Code

\documentclass[tikz, margin=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,calc, shapes.geometric, arrows}

\tikzset{
    process/.style={rectangle, minimum height=1cm, text centered, draw=black, fill=orange!30},
    arrow/.style={thick,->,>=stealth},
}

\begin{document}
\begin{tikzpicture}[node distance=1cm]

\node (start) [process] {1};
\node (node2r) [process, below right=of start] {2r};
\node (node3r) [process, below=of node2r] {3r};
\node (node4r) [process, below=of node3r] {4r};
\node (node2l) [process, below left=of start] {2l};
\node (node4l) [process, ] at (node2l|-node4r) {4l};
\node (end) [process] at ($(node4l)!.5!(node4r)+(0,-2cm)$) {5moretext};

\draw [arrow] (start) -| (node2r);
\draw [arrow] (start) -| (node2l);
\draw [arrow] (node2l) -- (node4l);
\draw [arrow] (node2r) -- (node3r);
\draw [arrow] (node3r) -- (node4r);
\draw [arrow] (node4r) |- (end);
\draw [arrow] (node4l) |- (end);

\end{tikzpicture}
\end{document}