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file1:
0, 4.38336420e+00, -2.47429684e-01, 6.79128885e+00, 1.51447906e+05
...
1, 4.38336420e+00, -2.47429684e-01, 6.69878864e+00, 3.29992562e+05
2, 4.38336420e+00, -2.78662264e-01, 6.69878864e+00, 3.30176656e+05
3, 4.38336420e+00, -2.78662264e-01, 6.79128885e+00, 3.42821781e+05

#!/usr/bin/perl -w

...
   $str =~ s/^\s+|\s+$//g;
   return $str;
}