\ S匹配不是空格字符的任何字符。

import java.util.regex.Matcher;

import java.util.regex.Pattern;
/**
时 代 J a v a
**/


public class Main {

  public static void main(String[] args) {

    Pattern pattern = Pattern.compile(".\\S.");

    Matcher matcher = pattern.matcher(" 2 ");

    if (matcher.matches())

      System.out.println("Match.");

    else

      System.out.println("Does not match.");

  }


}