How do you express [0-9.,]

[jacool]

I can do add("[0-9.,]") but it defies the purpose of the library.

[onilton]

It is not exactly the same, but you could do:

regex().oneOf(
      regex().range("0","9").build().toString(), 
      regex().anyOf(",.").build().toString()
).build()

Which would be equivalent to

(?:(?:[0-9])|(?:[\\,\\.]))

Simplifying for clarity:

([0-9]|[\\,\\.])