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string.lower

string.lower

  string string.lower( string str )
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Description

Changes any upper-case letters in a string to lower-case letters.

This function doesn't work on special non-English UTF-8 characters.

Arguments

1 string str
The string to convert.

Returns

1 string
A string representing the value of a string converted to lower-case.

Example

Demonstrates the use of this function.

print( string.lower( "ABCDEFG" ) ) print( string.lower( "AbCdefG" ) ) print( string.lower( "abcdefg" ) ) print( string.lower( "1234567890" ) )
Output:
abcdefg abcdefg abcdefg 1234567890

Example

Demonstrates a common use for string.lower - case-insensitive user input.

-- All keys in this table must be lowercase: local products = {} products.apple = "Buy an apple!" products.banana = "Buy a bunch of bananas!" products.tomato = "There's also tomatoes." -- This function is case-insensitive, meaning "APPLE", "apple", and "APPle" are all the same. function GetProduct( userinput ) return userinput, products[ string.lower( userinput ) ] end -- Demonstration: print( GetProduct( "apple" ) ) print( GetProduct( "Apple" ) ) print( GetProduct( "APPLE" ) ) print() print( GetProduct( "banana" ) ) print( GetProduct( "BaNaNa" ) )
Output:
apple Buy an apple! Apple Buy an apple! APPLE Buy an apple! banana Buy a bunch of bananas! BaNaNa Buy a bunch of bananas!

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