Regex arithmetic

: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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