split

function split( str, pattern ) --> strlst

Description

Splits str around matches of the given pattern.

Parameters

str

The string that should be split.

pattern

Lua pattern to identify the delimiter.

Return Values

strlst

Array table of strings computed by splitting this string around matches of the given pattern.

Code

--ZFUNC-split-v1
local function split( str, pattern ) --> strlst

   --ZFUNC-asciichunks-v1
   local function asciichunks( str, length )
      length = length or 1
      local chunks = {}

      local i = 1
      local last = string.len( str )
      while i <= last do
         local j = i + length - 1
         table.insert( chunks, str:sub( i, j ) )
         i = i + length
      end

      return chunks
   end

   if str == "" then return {} end

   pattern = pattern or "%s+"
   if pattern == "" then return asciichunks( str ) end

   local strlst = {}
   local position = 1
   local s, e = string.find( str, pattern, position )

   while s do
      table.insert( strlst, string.sub( str, position, s-1 ) )
      position = e + 1
      s, e = string.find( str, pattern, position )
   end

   if position <= #str then
      table.insert( strlst, string.sub( str, position ) )
   end

   if position > #str then
      table.insert( strlst, "" )
   end

   return strlst
end

return split

Examples

local t = require( "tapered" )
local split = require( "split" )

strlst = split( "a:b:c", ":" )
t.same( { "a", "b", "c" }, strlst )

strlst = split( ":a::c:", ":" )
t.same( { "", "a", "", "c", "" }, strlst )

strlst = split( "abc", "" )
t.same( { "a", "b", "c" }, strlst )

strlst = split( "a  +b c", " +" )
t.same( { "a", "+b", "c" }, strlst )

t.done()

Inspired by

See also