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Run-length encoding in Perl. Does not support integers :)
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| perl -E'print $+[1]-$l,$& and $l=$+[1] while $ARGV[0] =~ /(.)(?!\1)/g' aaabbbcdeee | |
| 3a3b1c1d3e | |
| perl -E'print $2 x $1 while $ARGV[0] =~ /(\d+)(.)/g' 3a3b1c1d3e | |
| aaabbbcdeee |
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