strikethrough_H_H_H_H_H_H_H_H_H_H_H_H_Hbackspace converter FIXED by recursive

import re
while 1:print re.sub("<(del|s|st.+?)>(.+?)</\\1>",lambda m:m.group(2)+"^H"*len(m.group(2)),raw_input())

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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return top