import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
String b
= "бла-бла-бла 12312312 бла-бла-бла-бла983-бла {1} {12 000 123,09}"; String result
= b.
replaceAll("(?:\\s*\\{[^{}]*})+\\s*$",
""); }
}
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