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/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* 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
	{
		String number = "1";
		String value = "test{#}";
		String output = "";
		
		output = value.replaceAll("\\Q{#}", number);
		System.out.println(output);
	}
}
Success #stdin #stdout 0.11s 320512KB
stdin
Standard input is empty
stdout
test1