listPattern top-level property
Unordered list
A line starting with one of these markers: -, *, +. May have up to
three leading spaces before the marker and any number of spaces or tabs
after.
Ordered list
A line starting with a number like 123.. May have up to three leading
spaces before the marker and any number of spaces or tabs after.
Implementation
final listPattern =
RegExp(r'^[ ]{0,3}(?:(\d{1,9})[\.)]|[*+-])(?:[ \t]+(.*))?$');