Tech stack collection about Tutorials Point -
String is a sequence of characters as well as control characters like form feed. String can be initialized with three forms which includes −
Characters between single quotes
Characters between double quotes" "Characters between [[ and ]][[]]
string1 = "Lua"
print("\"String 1 is\"",string1)
string2 = 'Tutorial'
print("String 2 is",string2)
string3 = [["Lua Tutorial"]]
print("String 3 is",string3)
\a Bell\b Backspace\f Formfeed\n New line\r Carriage return\t Tab\v Vertical tab\\ Backslash\" Double quotes\' Single quotes\[ Left square bracket\] Right square bracketstring.upper(arg)string.lower(arg)string.gsub(mainString,findString,replaceString)string.strfind(mainString,findString, optionalStartIndex,optionalEndIndex)string.reverse(arg)string.format(...)string.char(arg) and string.byte(arg)string.len(arg)string.rep(string, n))..Returns a string by replacing occurrences of findString with replaceString.
string = "Lua Tutorial"
-- replacing strings
newstring = string.gsub(string,"Tutorial","Language")
print("The new string is",newstring)
#output
The new string is Lua Language
Returns the start index and end index of the findString in the main string and nil if not found.
string = "Lua Tutorial"
-- replacing strings
print(string.find(string,"Tutorial"))
reversedString = string.reverse(string)
print("The new string is",reversedString)
#output
5 12
The new string is lairotuT auL
Returns a formatted string.
string1 = "Lua"
string2 = "Tutorial"
number1 = 10
number2 = 20
-- Basic string formatting
print(string.format("Basic formatting %s %s",string1,string2))
-- Date formatting
date = 2; month = 1; year = 2014
print(string.format("Date formatting %02d/%02d/%03d", date, month, year))
-- Decimal formatting
print(string.format("%.4f",1/3))
#output
Basic formatting Lua Tutorial
Date formatting 02/01/2014
0.3333
Returns internal numeric and character representations of input argument.
-- Byte conversion
-- First character
print(string.byte("Lua"))
-- Third character
print(string.byte("Lua",3))
-- first character from last
print(string.byte("Lua",-1))
-- Second character
print(string.byte("Lua",2))
-- Second character from last
print(string.byte("Lua",-2))
-- Internal Numeric ASCII Conversion
print(string.char(97))
#output
76
97
97
117
117
a
Returns a string by repeating the same string n number times.
string1 = "Lua"
string2 = "Tutorial"
-- Repeating strings
repeatedString = string.rep(string1,3)
print(repeatedString)
#output
LuaLuaLua
Thus operator concatenates two strings.
string1 = "Lua"
string2 = "Tutorial"
-- String Concatenations using ..
print("Concatenated string",string1..string2)
#output
Concatenated string LuaTutorial