Lua Programming/How to Lua/case conversion

The lua string library provides the string.upper and string.lower functions for converting strings to uppercase or to lowercase:

string.lower

Usage

string.lower(STRING)

Description

The string.lower function returns a lowercase version of the STRING argument. This function converts all letters to lowercase in the returned string. Only the returned string is converted, the provided argument remains unchanged:

print (string.lower("I Like Apples"))

string.upper

Usage

string.upper(STRING)

Description

The string.upper function returns a lowercase version of the STRING argument. This function converts all letters to uppercase in the returned string. Only the returned string is converted, the provided argument remains unchanged:

print (string.upper("I Like Apples"))

These functions are affected by the locale settings

These function are affected by the following locale environment variable settings.

• LC_ALL
• LC_CTYPE