Sorry to kick-in late, great guide j65nko! But was there a need for using regexp? Could have a simple sed 's/-/_/' file do the job? I see the pattern is repeating and you needed to change only the first occurrence of "-" in string (note there is no g at the end).
Also noone offered an awk solution to the problem:
Code:
awk '{ sub(/-/,"_"); print }' file
(also not using gsub for global change)
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