Perl + one-liner smart Perl command, in place grep to match unusual characters + full match

Question

Subject: one-liner smart Perl command instead of a simple grep (in Bash script)

I have a problem when I use grep to match the unusual characters (I can\'t put the \"\\\"

Answer 1

I'm not sure I understand your question, exactly. Perhaps -P and -x do what you want, along with quoting "$Some_string" to preserve whitespace?

grep -Px "$Some_string" file

From the grep man page:

-P, --perl-regexp

Interpret PATTERN as a Perl regular expression.

-x, --line-regexp

Select only those matches that exactly match the whole line.