Fix markdown-it-texmath rendering of /[a-z]+\*/ format environments

packages/core/src/lib/markdown-it/index.ts

@@ -33,7 +33,10 @@ markdownIt.use(require('markdown-it-mark'))
   .use(require('markdown-it-table-of-contents'))
   .use(require('markdown-it-task-lists'), { enabled: true })
   .use(require('markdown-it-linkify-images'), { imgClass: 'img-fluid' })
-  .use(require('markdown-it-texmath'), { engine: katex, delimiters: ['dollars', 'brackets'] })
+  .use(
+    require('./patches/markdown-it-texmath-fixed'),
+    { engine: katex, delimiters: ['dollars', 'brackets', 'beg_end'] },
+  )
   .use(require('markdown-it-attrs'))
   .use(require('./plugins/markdown-it-radio-button'))
   .use(require('./plugins/markdown-it-block-embed'))

packages/core/src/lib/markdown-it/patches/markdown-it-texmath-fixed.js

@@ -0,0 +1,18 @@
+/*
+ * Patch for markdown-it-texmath to support amsmath environments with trailing asterisk,
+ * e.g. \begin{equation*}\end{equation*}, \begin{align*}\end{align*}
+ */
+
+'use strict';
+
+const texmath = require('markdown-it-texmath');
+
+// Backup the original rules object
+const originalRules = { ...texmath.rules };
+
+// Modify the beg_end rule's regex to support more environment names with trailing asterisk
+originalRules.beg_end.block[0].rex = /(\\(?:begin)\{([a-z]+\*?)\}[\s\S]+?\\(?:end)\{\2\})/gmy;
+
+texmath.rules = originalRules;
+
+module.exports = texmath;