/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		List<String> strs = Arrays.asList("aaaa_b", "zzzzzz_i", "---------_f", "TTTTT_dt", "..._.");
		for (String str : strs)
			System.out.println("\"" + str + "\": " + str.matches(".*(?<!_[bif]|_dt)"));
 
	}
}

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