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  • \$\begingroup\$ Indeed, the input will not contain the $ character. \$\endgroup\$ Commented Mar 31, 2021 at 2:37
  • \$\begingroup\$ And what exactly happens if $ is in fact there? \$\endgroup\$ Commented Mar 31, 2021 at 20:27
  • \$\begingroup\$ @RomanOdaisky $$ will become a single $, and $& will become a (, \$\endgroup\$ Commented Apr 2, 2021 at 6:58