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Callbackslash solution in Creative category for Currency Style by veky
import re, functools
checkio = functools.partial(re.sub, r'\$\d{1,3}(?:\.\d{3})*(?:,\d{2})?(?![\d,])',
lambda match: match.group().translate(str.maketrans(',.', '.,')))
Feb. 14, 2016