Insert a newline character every 64 characters using Python

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Same as in Perl, but with a backslash instead of the dollar for accessing groups:

s = "0123456789"*100 # test string
import re
print re.sub("(.{64})", "\\1\n", s, 0, re.DOTALL)

re.DOTALL is the equivalent to Perl’s s/ option.

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