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Thanks pravin27 and michaelrozar17 very much.
I tried michaelrozar17's solution.
It can work for the string "LG 0 0 18 14 172.16.2.20 1 2 OK T OK T OK T".
However the number of the space used for...

Hi pravin27, thank you very much.

I tried and it doesn't still work.

So far, perl -nle command can work.

I have a question, if the source is a file, how to make the format with perl -nle?

Thanks Pravin27 again.
I tried the following sed, it strange that there is no change for the source. What's wrong with the expression?
sed 's/" \(\w+\s+\d+\s+\d+\)\(\s+\d+\).*/\1,\2/g'
...

Thanks pravin27,
Can it be implemented with sed?

Source is
" LG 0 0 18 14 172.16.2.20 1 2 OK T OK T OK T"

How to get the following format string with reg?
LG 0 0, 18

Thanks in advance.

Thanks your reply.

sed 's/[ ]/,/5' is to replace the fifth space with comma.

the result is "PUT 810 712 0001 ILC,AK4 00 0 00 00" and not the expected one.

source "PUT 810 712 0001 ILC AK4 00 0 00 00"
It needs to be changed to "PUT,810,712,0001,ILC,AK4 00 0 00 00"

Thanks in advance.