stackoverflowErorr for long curl, where we are calling `getArgsFromCommand()` about curl

[libetl]

Hi Saurabh,

Thanks for the feedback and for appreciating this lib.

Java impl for parsing regexs is using recursion to such an extend that we frequently notice stackoverflow errors.
What I tried to do was to make a powerful regex that is able to parse both simple quotes and double quotes.
I have no idea how to improve the regex without degrading it.
Instead, I implemented a placeholder feature to write text that will not be catched by the regex matcher.

Take a look at the placeholders unit test

curl/src/test/java/org/toilelibre/libe/outside/curl/CurlTest.java

Line 142 in 69c0025

this.assertOk (this.curl ("-k --cert-type $curl_placeholder_0 --cert $curl_placeholder_1 --key-type $curl_placeholder_2 --key $curl_placeholder_3 https://localhost:%d/public/",

For the biggest slices of arguments, you can consider putting them as placeholders.

Good luck and tell me if you are not satisfied with that solution.
We can think of having several regexs for more efficiency.