/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
Pattern r = Pattern.compile("(?<!\\S)P(?:O|\\.O\\.)\\h*#\\h*(\\d+)");
"PO # 123456",
"PO# 123456",
"PO #123456",
"P.O. # 123456",
"P.O.# 123456",
"P.O. #123456",
"Product: Multi Screen Encoder Version: 3.51.10 (008) Order Number: 0030000a9Ddy PO # 129999 Comment: some comments"
};
Matcher rm = r.matcher(str);
if(rm.find()) {
System.
out.
println(rm.
group(1)); }
}
}
}
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