Reading the comments between the OP and others, it seems that what the OP desires might be provided with \obeylines
. Perhaps this, therefore...
It allows \raggedright
and by scoping the extent of the \obeylines
, math environments like align
can be employed.
I have encapsulated it in an environment obey
, which takes as an optional argument the number of lines to back-skip upon exit, which may be needed when transitioning to displaystyle math environments.
Here is the MWE
\documentclass{article}
\usepackage{amsmath}
\newenvironment{obey}[1][0]{\obeylines\xdef\bsmult{#1}}{\par\vspace{-\bsmult\baselineskip}}
\edef\svparindent{\the\parindent}
\begin{document}
\begin{obey}[1]
JUSTIFIED: And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more.
this
is a
test.
And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more.
\end{obey}
\begin{align}
y &= mx + b\\
e &= mc^2
\end{align}
\begin{obey}
RAGGED:this continues the test.
\raggedright\parindent\svparindent\relax
And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more. And here, is more.
\end{obey}
This is the next text outside of \texttt{obey} mode.
\end{document}

parse lines
?parselines
.\\
should be very limited outside alignments such astabular
,matrix
and the like.