java 正则表达式去掉字符串中间的空格

	public String  replaceBlank(String str){
	   Pattern p=Pattern.compile("\\s*|\t|\r|\n");
	   //String str="I am a, I am Hello ok, \n new line ffdsa!"; 
	  // System.out.println("before:"+str);
	   Matcher m = p.matcher(str);
	   String after = m.replaceAll("");
	  // System.out.println("after:"+after);
	   return after;
	  // System.out.println("after:"+after); 
	}