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1 sed 's/\(test[ ,]*3,\)1/\12/'
2 sed 's/ / /'
3 sed 's/\( \) /\1 /'
4 sed 's/\(test[ ,]*3,\) /\1 /'
5 sed 's/\(test[ ,]*3,\)1/\12/'


Line 1 and line 5 are the...

You can always do several s commands with a single sed process. But I think you are looking for something like this...

sed 's/\(test[ ,]*3,\)1/\12/'

I think that
sed 's/,1/,2/'
is all you need.