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  1. or download this
    m/
  ^          # anchor to the beginning of the string
...
  (?:\.\d+)? # 0 or 1 decimal places followed by a number
  $          # anchor to the end of the string
/x
  2. or download this
    # some examples
/^-?\.?\d+/ matches 
...
    -.123.45 (probably a bug!) or
    -123.23532 or
    .235235235235.235235235235235325