You describe replacing only the first comma, but then expect exactly the opposite: "ABC,XYZ PERL IS AWESOME INNIT". It seems you want to remove all commas except for the first.

Try this. It "looks behind" for a comma, without consuming it; then matches (and stores) up to a comma; then replaces; and repeats. 

s/(?<=,)([^,]*),/\1/g;

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In reply to Re: Replace only selected characters by hbm
in thread Replace only selected characters by rohanan

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