jashkenas--coffeescript/documentation/examples/heregexes.coffee

NUMBER     = ///
  ^ 0b[01]+    |              # binary
  ^ 0o[0-7]+   |              # octal
  ^ 0x[\da-f]+ |              # hex
  ^ \d*\.?\d+ (?:e[+-]?\d+)?  # decimal
///i