On 21 January 2015 at 10:29, Rena <hyperhacker@gmail.com> wrote:
On Wed, Jan 21, 2015 at 2:33 AM, DouOlivia <olivia2046@hotmail.com> wrote:
Hi there,
Should have performed a search in the list first, but I’m afraid I cannot
come out with a good query. Here’s the question: Is there a library that can
calculate the ratio of numberic or alphanumeric words in a given string (the
actual scenario is to use a document’s content so the string will be very
long)? E.g for string “34 aaa A-7SXD bbb ccc”, the ratio is calculated as
0.4.
Seems like a simple task for Lua's pattern matching:
function countMatches(str, pat)
local c = 0
for word in str:gmatch(pat) do c = c + 1 end
return c
end
Couldn't resist... this version of countMatches() is shorter and
faster (on my machine at least) in long documents:
function countMatches(str, pat)
return select(2, str:gsub(pat, "%0"))
end
function ratio(text)
return countMatches(text, '%d+') / countMatches(text, '[%a%p]+')
end