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  1. or download this
    "1.233e+23",
"1.233"
  2. or download this
    "1.2e+233"
  3. or download this
     /^([+-]?)(?=\d|\.\d)\d*(\.\d)?([Ee]([+-]?\d+))?$/
  4. or download this
    /^([+-]?)(?=\d|\.\d+)\d*(\.\d+)?([Ee]([+-]?\d+))?$/