Good evening or something,

In fixes.py I would like to  change something this way: repeat the first group with a trailing 0 (zero) character.
Something like
 (ur'(x|y|z)', ur'\10')
This results in "the tenth group", and execution stops with "no such group" message. How can I explain to the bot that I want to copy \1 and a zero character immediately after it?

Thank you,
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Bináris