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The first example below works; the second one produces output containing garbage characters. (This came up while I was creating a set of examples for a tutorial on regular expressions).
import re
text= "The cat ate the rat."
print("before: %s" % text)
m= re.search("The (\w+) ate the (\w+)", text)
text= "The %s ate the %s." % (m.group(2), m.group(1))
print("after : %s" % text)
text= "The cat ate the rat."
print("before: %s" % text)
text= re.sub("(\w+) ate the (\w+)", "2円 ate the 1円", text)
print("after : %s" % text)