(\d *){8,}
It matches eight or more occurrences of a digit followed by zero or more spaces. Change it to
( *\d *){8,} #there is a space before first asterik
to match strings with spaces in the beginning. Or
(\s*\d\s*){8,}
to match tabs and other white space characters (that includes newlines too).
Finally, make it a non-capturing group with ?:. Thus it becomes (?:\s*\d\s*){8,}