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    \$\begingroup\$ The .* could just be . for a 1 byte saving, but you can save another 10 bytes by using Deduplicate instead of doing it manually! \$\endgroup\$ Commented Jun 21, 2019 at 18:37
  • \$\begingroup\$ @Neil Ah, didn't knew about the D-builtin, thanks! And not sure why I used .* instead of ... Thanks for -11 bytes in both versions! :) \$\endgroup\$ Commented Jun 21, 2019 at 19:25
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    \$\begingroup\$ FYI I had a slightly different approach for the same byte count: Try it online! \$\endgroup\$ Commented Jun 21, 2019 at 21:00
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    \$\begingroup\$ For the decimal version I found that -1`\B matches the desired insertion position directly. \$\endgroup\$ Commented Jun 22, 2019 at 23:17
  • \$\begingroup\$ @Neil Thanks again. \$\endgroup\$ Commented Jun 23, 2019 at 15:10