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<pre><code class="lang-javascript">let str=&apos;{&quot;asd&quot;:\\1234\\1234\\1234\\1234,&quot;true&quot;},
         {&quot;sada&quot;:\\1111\\1234\\1234\\4444,&quot;true&quot;}&apos;;
let substr = str.match(/&quot;sada&quot;:(\S*),&quot;true&quot;/);
console.log(substr[1]); // \\1111\\1234\\1234\\4444
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