st.button label empty if text is 'number." or starts with 'number.space"

[muxxxxxxx]

Checklist

• I have searched the existing issues for similar issues.
• I added a very descriptive title to this issue.
• I have provided sufficient information below to help reproduce this issue.

Summary

Label doesn't show if it starts with a number and is followed by a dot.
Also fails if followed by a space and additional text

Reproducible Code Example

import streamlit as st

if st.button('1.'):   #no label shown
    st.write('test 1')

if st.button('123. test'): #no label shown
    st.write('test 2')

if st.button('123.test'): #as expected
    st.write('test 3')

Steps To Reproduce

1. Just run the example

Expected Behavior

Labels should be shown

Current Behavior

No response

Is this a regression?

• Yes, this used to work in a previous version.

Debug info

• Streamlit version: 1.17
• Python version: 3.09
• Operating System: Win 11
• Browser: Firefox 109 / latest Edge
• Virtual environment: no
  

Additional Information

No response

Are you willing to submit a PR?

• Yes, I am willing to submit a PR!

[kajarenc]

Hello @muxxxxxxx, and thank you for reporting this issue!

We added support for Markdown in widget labels, and in this case, we have a collision that number with followed dot interpreted as a markdown list element (we don't support lists in widget labels.

Unsupported elements are not displayed. Display unsupported elements as literal characters by backslash-escaping them. E.g. 1\. Not an ordered list.

This clarification has already been added in docs and will be available during the next release!