I want some Vim script to remove percent encoding (where '%'
followed by two hex digits means the single character with the
given hex ASCII code, for example '%412' is 'A2').
It's easy to do this using :substitute with:
:s/%\(\x\x\)/\=nr2char('0x'.submatch(1))/g
However, submatch() does not work in substitute(), and
'\1' cannot be passed to a function (I think).
I would like either of the following to show 'abcAdef':
:echo substitute('abc%41def', '%\(\x\x\)', nr2char('0x'.submatch(1)), 'g')
:echo substitute('abc%41def', '%\(\x\x\)', nr2char('0x\1'), 'g')
But submatch() and \1 do not work here.
How can a submatch be used in an expression in substitute()?
John
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