//正则表达式,去掉空格、换行、制表位 public static void replaceBlank(){ Pattern p = Pattern.compile("\s*| | | "); String str=" I am a, I am Hello ok, new line ffdsa!"; System.out.println("before:"+str); Matcher m = p.matcher(str); String after = m.replaceAll(""); System.out.println("after:"+after); }