Formatting asterisks divided by space results in console error

[mrlugilugi]

Describe the bug
As described in #92 the same errors results from changing formatting of a text like '* *' to an unordered list.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://easy-markdown-editor.tk/
2. Enter text '* *' into editor
3. Select entered text
4. Click on button to format as unordered list
5. See error in console

Expected behavior
Selected text should be formatted as unordered list.

Screenshots

** Version information **

• OS: MacOS
• Browser: Chrome 91
• EasyMDE version: v2.15.0

Additional context
I tried escaping the regex "*" in

easy-markdown-editor/src/js/easymde.js

Line 1203 in c1d35b0

'unordered-list': '*',

like
\\*
and it seems to be a valid regular expression.