What were you expecting to happen?
The documentation says:
Both pattern and replacement must be valid Go expressions. In the
pat‐
tern, single-character lowercase identifiers serve as wildcards
match‐
ing arbitrary sub-expressions; those expressions will be
substituted
for the same identifiers in the replacement.
So if 'h' had shown up in the replacement, it would get replaced with the
original identifier - but it did not appear, instead H did.
It *looks* like you were expecting it to change the "hello, world\n" to
"Hello, world\n"? But gofmt's -r requires that both pattern and replacement
be valid Go expressions.
This:
gofmt -r "\"hello, world\\n\" -> \"Hello, world\\n\""
Has the effect I think you might have been going for. I'm not certain what
you were intending though, so I'm not sure of that.
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