Java Regular Expression To Check Numeric

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public class JavaStringNumeric {

	public static boolean isNumeric(String string) {
		return string.matches("^[-+]?\\d+(\\.\\d+)?$");
	}

	public static void main(String[] args) {
		System.out.println(isNumeric("123.123"));
		System.out.println(isNumeric("123"));
		System.out.println(isNumeric("12aa"));
	}

}
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