lua字符串分割

– gsplit: iterate over substrings in a string separated by a pattern

– Parameters:
– text (string) - the string to iterate over
– pattern (string) - the separator pattern
– plain (boolean) - if true (or truthy), pattern is interpreted as a plain
– string, not a Lua pattern

– Returns: iterator

– Usage:
– for substr in gsplit(text, pattern, plain) do
– doSomething(substr)
– end
local function gsplit(text, pattern, plain)
local splitStart, length = 1, #text
return function ()
if splitStart then
local sepStart, sepEnd = string.find(text, pattern, splitStart, plain)
local ret
if not sepStart then
ret = string.sub(text, splitStart)
splitStart = nil
elseif sepEnd < sepStart then
– Empty separator!
ret = string.sub(text, splitStart, sepStart)
if sepStart < length then
splitStart = sepStart + 1
else
splitStart = nil
end
else
ret = sepStart > splitStart and string.sub(text, splitStart, sepStart - 1) or ‘’
splitStart = sepEnd + 1
end
return ret
end
end
end

– split: split a string into substrings separated by a pattern.

– Parameters:
– text (string) - the string to iterate over
– pattern (string) - the separator pattern
– plain (boolean) - if true (or truthy), pattern is interpreted as a plain
– string, not a Lua pattern

– Returns: table (a sequence table containing the substrings)
local function split(text, pattern, plain)
local ret = {}
for match in gsplit(text, pattern, plain) do
table.insert(ret, match)
end
return ret
end