Your first pattern does not match the entire string, and field matching parts are [^ ]*, that is, any 0+ chars other than a space, so the last field cannot be matched (it contains spaces).
The second regex also contains \S+ patterns matching 1 or more chars other than whitespace, and the last one does not match the last field.
You may use
^(\S+)\t+(\S+)\t+(\S+)\t+(.+)
^([^\t]*)\t+([^\t]*)\t+([^\t]*)\t+(.*)
See the regex demo
The [^\t]* matches any field in a tab-delimited text since it matches zero or more chars other than a tab.
CLICK HERE to find out more related problems solutions.