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    \$\begingroup\$ I should probably make $0 implicit if a substitution starts with $*. It's a very common pattern and that would have let you beat Pyth. ;) \$\endgroup\$ Commented Feb 12, 2016 at 15:44
  • \$\begingroup\$ @MartinBüttner While you're at it you could make the right character default to something too :O \$\endgroup\$ Commented Feb 12, 2016 at 15:46
  • \$\begingroup\$ hm, not a bad idea. I'll think about it. \$\endgroup\$ Commented Feb 12, 2016 at 15:49