How to break a line between \begin and \end? #3057

kobayashi-dot · 2021-05-30T05:28:19Z

kobayashi-dot
May 30, 2021

I want to display a matrix [[a, b], [c, d]] but the following code doesn't work:

<!DOCTYPE html>
<head>
    <meta charset="utf-8">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.13.11/dist/katex.min.css" integrity="sha384-Um5gpz1odJg5Z4HAmzPtgZKdTBHZdw8S29IecapCSB31ligYPhHQZMIlWLYQGVoc" crossorigin="anonymous">

    <script src="https://cdn.jsdelivr.net/npm/katex@0.13.11/dist/katex.min.js" integrity="sha384-YNHdsYkH6gMx9y3mRkmcJ2mFUjTd0qNQQvY9VYZgQd7DcN7env35GzlmFaZ23JGp" crossorigin="anonymous"></script>
</head>
<body>
    <div id="math">
        $$\begin{matrix}
        a & b\\
        c & d
        \end{matrix}$$
    </div>
    <script>
        const katex = window.katex
        const math = document.getElementById('math')
        math.innerHTML = math.textContent
      .replace(/\$\$(.*?)\$\$/g, function (outer, inner) {
        return katex.renderToString(inner, { displayMode: true })
      })
      .replace(/\$(.*?)\$/g, function (outer, inner) {
        return katex.renderToString(inner, { displayMode: false })
      })
    </script>
</body>

However, this works:

<div id="math">
  $$\begin{matrix}a & b\\ c & d\end{matrix}$$
</div>

In other words, I can't break the line between \begin and \end.

Answered by edemaine

May 30, 2021

This is because the regular expression character . doesn't match newline (it matches everything except newline). You could use [^] to match everything.

Is there a particular reason you're not using the auto-render extension, which does the $ matching for you?

View full answer

edemaine · 2021-05-30T14:22:44Z

edemaine
May 30, 2021
Maintainer

This is because the regular expression character . doesn't match newline (it matches everything except newline). You could use [^] to match everything.

Is there a particular reason you're not using the auto-render extension, which does the $ matching for you?

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How to break a line between \begin and \end? #3057

kobayashi-dot May 30, 2021

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edemaine May 30, 2021 Maintainer

kobayashi-dot
May 30, 2021

edemaine
May 30, 2021
Maintainer