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The only way I've been able to make awk work reliably from Windows CMD is to put the code into a text file and run it with -f.

/[^\t]/

awk -f mycode.txt filename

You need the "\(...\)" device for this. This way you can replicate parts of the matched regexp in the substitution:

sed 's/0\([0-9]\)/\1/'

will replace any "0" followed by a digit with this...

sed doesn't work that way. putting [0-9] in the output pattern will not cause it to substitute any of the input.

To do that, you want a backreference.

sed 's#0\([0-9]\)/#\1/#'