One of the features I always liked about Perl, which I felt set it apart from other languages, is the way regular expressions are part of the language syntax rather than an OOP library. In other languages, regular expressions seem very clumsy to use, while in Perl they&#x27;re very natural. This is most evident when you&#x27;re trying to use capturing parentheses; the differences between Perl and, say, C#, are huge.<p>Back in the day, I thought it would be a great addition to Perl if xml&#x2F;html was also added to the language syntax. This was before html templating systems existed, and CGI.pm wasn&#x27;t a good choice for my web application, so my code was full of print statements, quoted strings containing html, and having to use qq!...! for my quotes to avoid problems with &quot; and &#x27; characters in the output I wanted.<p>When I first saw JSX it seemed like a great thing, finally satisfying that old desire to have html markup as a native language syntax feature. I feel like it can be transformative, in the way you write your code, just like Perl&#x27;s regex syntax or like having functions as first-class values can be in functional languages.<p>Having used React.js a bit, I&#x27;m not so sure. But I&#x27;m probably biased because I don&#x27;t think React.js fits well with what I&#x27;m trying to do: ASP.NET MVC web applications that are mostly traditional full-page-refresh style apps, with some SPA-like AJAX-based interaction on some pages. I wanted to use React.js for those SPA-like pages, but it doesn&#x27;t integrate well (or at all) with Razor-based server-side rendering, and in my testing it had a significant 1000ms+ startup time when the page loaded even for pretty trivial components, with caching of the React and Babel javascript files.