/* 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
{
{
Pattern ptrn = Pattern.compile("\\b123\\b");
Matcher matcher = ptrn.matcher(str);
if (matcher.find()) {
}
}
}
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