/* 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
{
{
String s
= "(identifier1 identifier_2 23 4) ____ 33"; String p
= "\\b(?!\\d+\\b)[A-Za-z0-9]+(?:_[A-Za-z0-9]*)*\\b"; System.
out.
println(s.
replaceAll(p,
"$0#")); }
}
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