Matching numbers with regular expressions — only digits and commas

Question

I can\'t figure out how to construct a regex for the example values:

123,456,789
-12,34
1234
-8

Could you help me?

Answer 1

In java, You may use java.util.Scanner with its useLocale method

Scanner myScanner =  new Scanner(input).useLocale( myLocale)

isADouble = myScanner.hasNextDouble()