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regex="\\d+[+-*/]\\d+[+-*/]\\d+[+-*/]\\d+"
regex="\\d+[(][+-*/][)]\\d+[(][+-*/][)]\\d+[(][+-*/][)]\\d+"
import javax.script.*;
class Test {
public static void main(String[] args) {
ScriptEngine se = ScriptEngineManager.getEngineByName("JavaScript");
String ex = "1+2*3-4/5";
Object value = se.eval(ex);
System.out.println(value);
}
}