sample text file containing tabs!
1234567812345678123456781234567812345678123
123456	123456	  345678123456		123
12345	12345	   4567812345		123
1234	1234	    56781234		123
123	123	     678123		123
12	12	      7812		123
1	1	       81		123
 ^^^^^^^ ^^^^^^^ ^^^^^   ^^^^^^ ^^^^^^^
  tab     tab    spaces  tab     tab

the following text is has no tabs: 
1234567812345678123456781234567812345678123
123456  123456    345678123456          123
12345   12345      4567812345           123
1234    1234        56781234            123
123     123          678123             123
12      12            7812              123
1       1              81               123