perhaps SC2140 should be suppressed for "\"" case

[John-L]

For new checks and feature suggestions

• https://www.shellcheck.net/ (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows a potential problem:

[sed-test.sh](https://github.com/user-attachments/files/30521071/sed-test.sh)

#!/bin/sh
``sed -rn "s/.*?\ssrc="\""(.*?)"\""\s.*?/\n==>\\1 /gIp" <"jufr/index.html"

#### Here's what shellcheck currently says:
SC2140 (warning)


#### Here's what I wanted to see:
[no error]

[kurahaupo]

Question: why write nested double quotes like
"Barnie Rubble said "\""Hi Fred"\"" on his way to the quarry"
when
"Barnie Rubble said \"Hi Fred\" on his way to the quarry"
suffices?

(This is different from single quotes, where \ is always literal, not an escape of the following character.)

[wileyhy]

Well, beginning a sed command with two backticks seems problematic

…

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