Convert letters to lower case

Question

I use the following with respect to letters from any language:

text = regex.sub("[^\p{alpha}\d]+"," ",text

Can I use p{alpha} to convert letters to their lower case equivalent if such an equivalency exists? How would this regex look?

Answer 1

>>> re.sub('[AEIOU]+', lambda m: m.group(0).lower(), 'SOME TEXT HERE')
'SoMe TeXT HeRe'

Answer 2

As oxtopus suggested, you can simply convert letters to their lowercase version with text.lower() (no need for a regular expression). This works with Unicode strings too (À -> à, etc.)