Hi,

I could make it work with : 
perl -pe 's/^([^"]+)"(.+)"/($x = $2) =~ y{\t}{,}s;"$1\"$x\""/e'

[download]
Here is another try for the input file : 
a    b    c d    "x1    x2"
c    d    e    "x2"
e    f    h    "x3    x4 x5    x6"

[download]
The expected result :
a    b    c d    "x1,x2"
c    d    e    "x2"
e    f    h    "x3,x4 x5,x6"

[download]
Thanks again to all of you for your useful help.
Regards.
Xuo.

In reply to Re: How to substitute all tabs only in a specific field by xuo
in thread How to substitute all tabs only in a specific field by xuo

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