Lua学习九----------Lua字符串

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 1.Lua字符串

  - ''单引号间的一串字符

  - ""双引号之间的一串字符

  - [[]]之间的一串字符

2.Lua转义字符

  

3.字符串操作

  - string.upper(argument):将字符串全部转换成大写

  - string.lower(argument):将字符串全部转换成小写

  - string.gsub(mainString, findString, replaceString, num):替换字符串

    - mainString:要替换的字符串

    - findString:将被替换的字符串

    - replaceString:要替换的字符串

    - num:替换次数(可以忽略,替换全部)

  - string.find(str, substr, index):在一个指定的字符串中搜索指定的内容并返回其具体位置,不存在返回nil

    - str:指定的字符串

    - substr:指定的内容

    - index:索引(默认1)

  - string.reverse(arg):将字符串反转

  - string.format(...):格式化字符串

  - string.char(args):将整型数字转成对应的字符并连接

  - string.byte(args, index):将字符串转换成对应的ASCII码,index指定字符串,默认第一位

  - string.len(args):计算字符串长度

  - string.rep(args, n):拷贝字符串,n表示拷贝次数

  - ..:连接两个字符串

4.string.lua

a = 'This is a string'						-- ''字符串
b = "This is b string"						-- ""字符串
c = [[This is c string]]					-- [[]]字符串
print("a:" .. a)
print("b:" .. b)
print("c:" .. c)

d = "Escape "
e = " character"
print("\n\"\\a\": " .. d .. "\a" .. e)		-- \a(响铃-BEL-007)
print("\"\\b\": " .. d .. "\b" .. e)		-- \b(退格-BS-008)
print("\"\\f\": " .. d .. "\f" .. e)		-- \f(换页-FF-012)
print("\"\\n\": " .. d .. "\n" .. e)		-- \n(换行-LF-010)
print("\"\\r\": " .. d .. "\r" .. e)		-- \r(回车-CR-013)
print("\"\\t\": " .. d .. "\t" .. e)		-- \t(水平制表-HT-009)
print("\"\\v\": " .. d .. "\v" .. e)		-- \v(垂直制表-VT-011)
print("\"\\\\\": " .. d .. "\\" .. e)		-- \\(反斜线字符-\-092)
print("\"\\'\": " .. d .. "\'" .. e)		-- \'(单引号字符-'-039)
print("\"\\\"\": " .. d .. "\"" .. e)		-- \"(双引号字符-"-034)
print("\"\\0\": " .. d .. "\0" .. e)		-- \0(空字符-NULL-000)

str = "This is test String"
result = string.upper(str)					-- upper:将字符串转换成大写
print("\result = " .. result)					
result = string.lower(str)					-- lower:将字符串转换成小写
print("result = " .. result)
result = string.gsub(str, "s", "S", 2)		-- gsub:替换字符串
print("result = " .. result)
result = string.find(str, "is", 1)			-- find:搜索指定内容,并返回下标
print("the index of \"is\" in \"" .. str .. "\":", result)
result = string.reverse(str)				-- reverse:字符串反转
print("result = " .. result)
result = string.format("result = %s", str)	-- format:格式化字符串
print(result)
result = string.char(66, 77, 88, 99)		-- char:将整型数字转成字符并连接
print("string.char(66, 77, 88, 99) = " .. result)
result = string.byte("qAzWsx", 3)			-- byte:将指定字符转化成整数值
print("string.byte(\"qAzWsx\", 2) = " .. result)
result = string.len(str)					-- len:计算字符串长度
print("str的长度: " .. result)
result = string.rep(str, 4)					-- rep:将字符串复制n次
print("result = " .. result)
result = str .. " Hello"					-- ..:连接两个字符串
print("result = " .. result)				

5.效果预览

参考:http://www.runoob.com/lua/lua-strings.html

posted @ 2017-05-11 18:02  禁忌夜色153  阅读(466)  评论(0编辑  收藏  举报