strikethrough_H_H_H_H_H_H_H_H_H_H_H_H_Hbackspace converter FIXED by leonid

#!ruby -p
gsub(/<([sd][e-t]*>)(.+?)<.\1/){$2+'^H'*$2.size}

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

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