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  1. or download this
    while (<DATA>) {
  /\./ ? s/(?<=\d)(?=(\d{3})+(?:\.))/,/g
...
1234567
+12345678.12
-123456789.12345678
  2. or download this
    123
1,234
...
1,234,567
+12,345,678.12
-123,456,789.12345678