Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

var msg = "ns2.6 - Some rather interesting details about NS 2.6\n\
ns3.8 - Some rather interesting details about NS 3.8\n\
jp1.0 - Some interesting details about JP 1.0\n\
jp1.0b - More interesting details about JP 1.0b\n\
jp2.1 - Some interesting details about JP 2.1\n";
var file =  'jp1.0';   
var discr = (msg).match(new RegExp(file+'(.*)\n'))[0];
alert(discr);

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JSFiddle - React, Tailwind, and code Playground

JavaScript

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Use pre-released features

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Console