string.split=function(str,token)
ret={}
_,token_num=string.gsub(str,token,'')
f=''
for i=1,token_num do
f=f..'(.-)'..token
end
f=f..'(.+)'
for j=1,token_num+1 do
ret[j]=select(j+2,string.find(str,f))
end
return ret
end
test="5125,123,15,354"
o=string.split(test,',')
for k,v in pairs(o) do
print("key:"..k..", value:"..v)
end
写完之后，看到一个大神写的更加简单
string.split = function(s, p)
local rt= {}
string.gsub(s, '[^'..p..']+', function(w) table.insert(rt, w) end )
return rt
end
使用例子一
local str = 'abc,123,hello,ok'
local list = string.split(str, ',')
for _, s in ipairs(list） do
print(s)
end
结果：
abc
123
hello
ok
他的这种方法利用了gsub的一种参数方法
string.gsub (s, pattern, repl [, n])
Returns a copy of s in which all occurrences of the pattern
have been replaced by a replacement string specified by repl,
which may be a string, a table, or a function.
gsub also returns, as its second value, the total number of substitutions made.
repl是字符串，则为替换。 如果在参数前有%则表示符合匹配的字符串
If repl is a string, then its value is used for replacement.
The character % works as an escape character:
any sequence in repl of the form %n, with n between 1 and 9, stands for the
value of the n-th captured substring (see below).
The sequence %0 stands for the whole match. The sequence %% stands for a single %.
repl作为表参数
If repl is a table, then the table is queried for every match,
using the first capture as the key; if the pattern specifies
no captures, then the whole match is used as the key.
如果参数为函数，则每次匹配成功则调用该函数
If repl is a function, then this function is called every
time a match occurs, with all captured substrings passed
as arguments, in order;
if the pattern specifies no captures,
then the whole match is passed as a sole argument.
If the value returned by the table query or by the function call is a string or a number,
then it is used as the replacement string; otherwise, if it is false or nil,
then there is no replacement (that is, the original match is kept in the string).
参数n则限制最大
The optional last parameter n limits the maximum number of substitutions to occur.
举例：
%1 表示符合模式的第一个匹配
x = string.gsub("hello world", "(%w+)", "%1 %1")
--> x="hello hello world world"
第4项
x = string.gsub("hello world", "%w+", "%0 %0", 1)
--> x="hello hello world"
hello 和from作为模式中左匹配为%1，world 和lua为右匹配，为%2
x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
--> x="world hello Lua from"
替换 以$打头的字符串
x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
--> x="home = /home/roberto, user = roberto"
参数为函数类型
x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
return loadstring(s)()
end)
--> x="4+5 = 9"
参数为表类型
local t = {name="lua", version="5.1"}
x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
--> x="lua-5.1.tar.gz"
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