Re: Number patterns

[Shmuel Zeigerman <shmuz@...>]

Dirk Laurie wrote:
> I'm writing an input checker for a non-Lua application.  It makes
> liberal use of positive F-format real numbers, e.g. 3, .1, 3., 3.1.
> Can one do that with just one pattern, assuming whitespace already
> trimmed?

It is impossible with just one Lua pattern. Use LPeg or Lrexlib.
Here is the pattern for Lrexlib:
    [[^\d+\.\d*|\.?\d+$]].
Or, alternatively, test it with 2 Lua patterns (in the given order):
    "^%d+%.%d*$" and "^%.?%d+$".

--
Shmuel