Curl get only a specific piece of data

Question

I have been experimenting with curl on the command line recently and was wondering if the following is possible.

I did the following command:

curl --data "ToBinary=fubar" http://www.roubaixinteractive.com/PlayGround/Binary_Conversion/Binary_To_Text.asp

What I get back is the entire page with the appropriate response (a webpage with the data I want), but I only want a specific piece of data (0110011001110101011000100110000101110010).

Without additional processing, is there a way to get this information directly?

Answer 1

You should use a html parser to extract the binary string and I think that curl cannot do that. One of many alternatives is perl and its mojolicious module that lets you post the page and use a DOM parser to extract the content, like this:

perl -Mojo -E '
    say p(q{http://www.roubaixinteractive.com/PlayGround/Binary_Conversion/Binary_To_Text.asp} 
        => form 
        => { ToBinary => q{fubar} })
    ->dom
    ->at(q{#ToText})
    ->text'

It yields:

0110011001110101011000100110000101110010