Re: pattern matching problem

[Shmuel Zeigerman <shmuz@...>]

On 30/08/2013 23:14, Geoff Smith wrote:
> I am trying to trim a number string to remove non significant trailing zeros. So for example
>
> "123.450000000" = "123.45"
> "1234500" = "1234500"
> "12345.00" = "12345.0"
>
> I could of course write a function that iterates through the string from the back dropping zeros, but I thought there is probably a more elegant solution using Lua pattern matching functions.
>
> Can this be done neatly with pattern matching ? Thanks for any suggested code snippets

local function trim(s)
  s = s:gsub("(%.%d-)0+$", "%1"):gsub("%.$", ".0")
  return s
end

--
Shmuel