import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class Ideone
{
{
String str
= "Rate is : .97 . XXXXXXXXX do you want . 87 to perform another calculation . "; String pattern
= "(?<!\\S)\\.[0-9]"; System.
out.
println(str.
replaceAll(pattern,
"0$0")); }
}
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