Help with extension about marked

[calculuschild]

This type of offset issue usually means you need to start your rule regex with a ^ to anchor it to the start of the src string.

Otherwise you may have cases where your extension matches tokens further out in the src, skipping over text and introducing an offset into where Marked thinks the currently-processed character is.

[ivanjaros]

Yes, that worked. I tried it before but I broke it altogether so I though it was a dead end but just the prefix caret fixed it const rule = /(^\[gallery\]\n)([\s\S]*?)(\n\[\/gallery\]\n)/;