:h submatch( includes
Example:
:s/\d\+/\=submatch(0) + 1/
This finds the first number in the line and adds one to it.
Needing to increment several fields consisting of underscore and a single
digit (_\d) I modified the above along the lines of
s/_\(\d\)/\='_'.submatch(1) + 1/gc
most of which merely replaced the entire field with '1'
Thinking the problem might be a conflict between the types, string and
number, I tried
s/_\(\d\)/\="_".nr2char(submatch(1) + 1)/gc
then
s/_\(\d\)/\="_".nr2char(submatch(1) + 31)/gc
and finally success with
s/_\(\d\)/\="_".nr2char(submatch(1) + 49)/gc
which is limited to operations on just a single digit.
So, is there a generally reliable method of performing arithmetic on
numeric fields embedded in a larger string pattern with :s? Thank you.
--
Graham Lawrence
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