利用正则表达式 对字符串进行操作(截取、提取...)

	//提取数字
	public String numberintercept(String num) {
		String phonestring =num;
		Pattern pattern = Pattern.compile("[^0-9]");
		Matcher matcher = pattern.matcher(phonestring);
		String all = matcher.replaceAll("");
		return Pattern.compile("[^0-9]").matcher(phonestring).replaceAll("");
	}

<span style="white-space:pre">	</span>//提取汉字
	public String intercept(String str) {
		String regex = "[\u4E00-\u9FA5]+";// [//u4E00-//u9FFF]为汉字
		Pattern pattern = Pattern.compile(regex);
		Matcher matcher = pattern.matcher(str);
		StringBuffer sb = new StringBuffer();
		while (matcher.find()) {
			sb.append(matcher.group());
		}
		String content = sb.toString();
		return content;
	}

<span style="white-space:pre">	</span>//过滤不想要的特殊符号
	public String con (String str) {
		String regEx="[`~!@#$%^&*()+=|{}:;\\[\\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]"; 
		Pattern p = Pattern.compile(regEx); 
		Matcher m = p.matcher(str);
		String url =  m.replaceAll("").trim();
		return url;
	}