Split string using tab,space as delimeter

[equebal]

I read a txt file in a variable and split it in array. Field seperator used in my file is Tab or space (space can be one or more). when i split it by using delimeter TAB then it skips space. pls tell me how can it read space (any number of space)and Tab.

example of txt file

1 0 100 100
2 101 175 75
3 176 250 75
4 251 500 250