[BUG] - Markdown label doesn't accept dot "." anymore

[kabaluyot]

Description

Labels wont accept dot "." anymore which is commonly used for numbering, links.

Steps to reproduce

When trying to assign a label say:

A --> |visit facebook.com| B

It detects it with ``Unsupported markdown: link` error. It worked before.

Screenshots

No response

Code Sample

Setup

• Mermaid version:
• Browser and Version: [Chrome, Edge, Firefox]

Suggested Solutions

No response

Additional Context

No response

[BambioGaming]

Hi, @kabaluyot

Thanks for reporting this issue! To help the maintainers understand and debug the problem effectively, could you please provide additional details?

Provide a Code Sample

Could you share the exact Mermaid diagram code that is causing this issue? This will help in reproducing the bug.
For example, if you're seeing an error when using a label with a dot (.), something like this would be helpful:

graph TD;
  A --> |visit facebook.com| B

It works fine in the live editor. If the issue occurs in a different context (e.g., inside a subgraph or another diagram type), please provide the specific full code sample you're using.

Share More Screenshots

If possible, could you attach more screenshots of the issue?

One showing the Mermaid Live Editor or your environment where the error appears.
One showing the console errors (if any) from the browser developer tools (F12 → Console).

Confirm Your Environment

To help narrow down the cause, please provide:

Mermaid.js Version.
Browser and Version.

This information will make it easier for the maintainers to investigate and confirm if this is a bug or an intended change.

[StefanBrand]

related to #6099