However, the original poster specified one /g and two non-/g replacements. If that is the real intent, then a data-table solution would need to flag the repeatable replacements versus the singular replacements. If they all should be repeatable, then the data solutions offered are very useful.
Also, a note to the original poster: s/man/boy/ would create a lot of strings like "read the fine boyual" in a general text. You may want to learn what the zero-width assertion \b does inside a regex. s/\bman\b/boy/g; s/\bmen\b/boys/g may help you out.
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