js and java digital regular verification

js:

/^(\+?|-?)\d+(\.\d+|\d*)$/

测试：/^(\+?|-?)\d+(\.\d+|\d*)$/.test("123456789");

java

^(\+?|-?)\d+(\.\d+|\d*)$

测试：Pattern.matches("^(\+?|-?)\d+(\.\d+|\d*)$","123456789");