Website: Add metadata error to build-static-content (#7776)

* add error message to metadata processing

* Update error message

Co-authored-by: Mike McNeil <mikermcneil@users.noreply.github.com>

website/scripts/build-static-content.js

@@ -354,11 +354,15 @@ module.exports = {
               // >   <meta name="title" value="Sth with punctuATION and weird CAPS ... but never this long, please">
               // >   ```
               let embeddedMetadata = {};
-              for (let tag of (mdString.match(/<meta[^>]*>/igm)||[])) {
-                let name = tag.match(/name="([^">]+)"/i)[1];
-                let value = tag.match(/value="([^">]+)"/i)[1];
-                embeddedMetadata[name] = value;
-              }//∞
+              try {
+                for (let tag of (mdString.match(/<meta[^>]*>/igm)||[])) {
+                  let name = tag.match(/name="([^">]+)"/i)[1];
+                  let value = tag.match(/value="([^">]+)"/i)[1];
+                  embeddedMetadata[name] = value;
+                }//∞
+              } catch (err) {
+                throw new Error(`An error occured while parsing <meta> tags in Markdown in "${path.join(topLvlRepoPath, pageSourcePath)}". Tip: Check the markdown being changed and make sure it doesn\'t contain any code snippets with <meta> inside, as this can fool the build script. Full error: ${err.message}`);
+              }
               if (Object.keys(embeddedMetadata).length >= 1) {
                 sails.log.silly(`Parsed ${Object.keys(embeddedMetadata).length} <meta> tags:`, embeddedMetadata);
               }//fi