Regular Expression: removes 0 characters from the Lua string.

Because the Lua string can contain 0 characters, it cannot appear in C/C ++. Otherwise, the string will be truncated and unexpected results will appear.

Here, the regular expression is used to remove the 0 characters in the Lua string:

-- There may be Terminator s = ''; for name in string. gmatch (wndtext," [^ % z] ") do s = s .. name; end

% Z indicates 0 characters, ^ % z indicates non-zero characters, [] is used to create character sets, the whole regular expression means to match any non-zero character in the entire string, concatenate these non-zero characters in a loop to remove the string after the 0 characters.