lua-users home
lua-l archive

[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index] [Thread Index] 

Rici Lake wrote:


On 25-Jan-06, at 2:17 PM, Brian Weed wrote:


Is there a library function for a reverse find



Sadly, no.


, or do I have to do it manually as in:

-- untested
i = 0
do
   i = i - 1
   p = string.find(s, ".", i, true)
while (p == nil and i ~= -string.len(s))
(I'm searching for the file extension, and there may be other dots in the filename) 


A better way:

  local _, _, extension = string.find(s, ".*%.(.*)")


This works too:

local _, _, extension = string.find(s, "([^.]*)$")
Or perhaps string.find(s, "%.([^.]*)$") if you want to be sure that there is a dot in the input string. 

					-Mark