While using the $str(text, N), if there are blank spaces in the text, the repetition can keep that blank space?

EG: $str(abcd,3) return abcdabcdabcd
Therefore, there must be: $str(abcd ,3) return abcd abcd abcd
It was true?

Yes, except you're using a litteral space here, and mIRC removes them, $str(abcd $+ $chr(32),3) will work