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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Convert the shell command used in emacs init-file into its normal
 version.
Date: Wed, 09 Jun 2021 14:37:22 +0300
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 (message from Hongyi Zhao on Wed, 9 Jun 2021 14:49:00 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Wed, 9 Jun 2021 14:49:00 +0800
> 
> I found the following command from
> <https://github.com/jethrokuan/mathpix.el/blob/02016ca4aee9ffce32e730372f45de35c00a3657/mathpix.el#L49>:
> 
> "curl -s https://api.mathpix.com/v3/latex -X POST -H \"app_id: %s\" -H
> \"app_key: %s\" -H \"Content-Type: application/json\" --data
> \"{\\\"src\\\":\\\"%s\\\",\\\"formats\\\":
> [\\\"latex_styled\\\"],\\\"format_options\\\":{\\\"latex_styled\\\":
> {\\\"transforms\\\": [\\\"rm_spaces\\\"]}}}\""
> 
> I want to obtain its normal version and test it under the system's
> shell terminal. Any hints for deleting the escape characters correctly
> from the above command in Emacs way?

Did you try using split-string-and-unquote?