strings 
Usage
local inspect = require("inspect")
local strings = require("strings")
-- strings.split(string, sep)
local result = strings.split("a b c d", " ")
print(inspect(result, {newline="", indent=""}))
-- Output: { "a", "b", "c", "d" }
-- strings.has_prefix(string, prefix)
local result = strings.has_prefix("abcd", "a")
-- Output: true
-- strings.has_suffix(string, suffix)
local result = strings.has_suffix("abcd", "d")
-- Output: true
-- strings.trim(string, cutset)
local result = strings.trim("abcd", "d")
-- Output: abc
-- strings.contains(string, substring)
local result = strings.contains("abcd", "d")
-- Output: true
Reader/Writer classes often used with json+yaml Encoder/Decoder
reader = strings.new_reader([[{"foo":"bar","baz":"buz"}]])
assert(reader:read("*a") == [[{"foo":"bar","baz":"buz"}]])
writer = strings.new_builder()
writer:write("foo", "bar", 123)
assert(writer:string() == "foobar123")