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I'm trying to convert some French text to upper case in lua, it is not converting the accented characters. Any idea why?
test script:
print('échelle')
print(string.upper('échelle'))
print('ÉCHELLE')
print(string.lower('ÉCHELLE'))
output:
échelle
éCHELLE
ÉCHELLE
Échelle
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Valid in Lua, where %w is (almost) the equivalent of \w in other languages. ^[%w-.]+$ means match a string that is entirely composed of alphanumeric characters (letters and digits), dashes or dots.
Another important function of the Lua's string library is the string. sub() function. The string. sub() function is used to extract a piece of the string.
It might be a bit overkill, but you can do this with slnunicode (which is available in LuaRocks).
require "unicode"
print(unicode.utf8.upper("échelle"))
-- ÉCHELLE
You may need to use unicode.ascii.upper or unicode.latin1.upper depending on the encoding of your source files.
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