java正则练习，提取文本，获取所需内容

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GetCouponId {

	public static void main(String[] args) {
		String str1 = 
				"券ID:384736283 血糖仪tt\r\n" + 
				"券名：j88\r\n" + 
				"优惠券：http://coupon.m.jd.com/coupons/show.action?key=2062ee9c50df425ea6f60a93fa54468e&roleId=59336228&to=item.jd.com\r\n" + 
				"\r\n" + 
				"SKU：29756946040  P：20\r\n" + 
				"服务费：8";
		String str2 = 
				"优惠券名称： j88-华夫饼\r\n" + 
				"原始优惠券：http://coupon.m.jd.com/coupons/show.action?key=c3e0d8e2a5ad411fb02da3f85fcbdf01&roleId=57629132&to=htkfood.jd.com\r\n" + 
				"SKU + P：1145218255   20\r\n" + 
				"服务费:5%";
		
		String[] split1 = str1.split("\n");
		String s = split1[0];
		String reg = "[a-zA-Z]";
	    Pattern pattern = Pattern.compile(reg);
		Matcher matcher = pattern.matcher(s);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()){
        sb.append(matcher.group());
        }
        String s2 = sb.toString();
        sb.delete(0, sb.length());
        String couponId ="";
        if(s2.indexOf("ID")!=-1 || s2.indexOf("id") !=-1 || s2.indexOf("Id")!=-1 || s2.indexOf("iD")!=-1) {
        	couponId = Pattern.compile("[^0-9]").matcher(s).replaceAll("");
			System.out.println(couponId);
        }
        String key="";
        if(!couponId.equals("")) {
        	for(int i=1;i<split1.length;i++) {
    			sb.append(split1[i]);
    		}
        	key = sb.toString();
        }else {
        	key = str2;
        }
		System.out.println(key);
	}

}