import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
String regex
= "(?=(?<!_)[A-Z](?![A-Za-z]*_))|(?<!_[A-Za-z]{0,1000}|^)(?=[A-Z])|_"; String str
= "ThisIsA_SimpleTest_Case"; String[] parts
= str.
split(regex
);
}
}
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