wezterm.split_by_newlines(str)

{{since('20200503-171512-b13ef15f')}}

This function takes the input string and splits it by newlines (both \n and \r\n are recognized as newlines) and returns the result as an array of strings that have the newlines removed.

local wezterm = require 'wezterm'

local example = 'hello\nthere\n'

for _, line in ipairs(wezterm.split_by_newlines(example)) do
  wezterm.log_error(line)
end