我有这样的字符串：

<a href="https://host-test.com/create?userName=test3&amp;user-mail=myemail@gmail.com&amp;id=14b72820-3855-4f2b-9a39-543ced6784a0&amp;downloadurl=https://host-test.com:443/123/rest/tmp-z7vvymo3wmfzke/vfs/v2/downloadzip/&amp;projectid=d29ya3NwYWNleXFpYXlwZjgwb2sxNDA2MjovY3JlYXRlQWNj:createAcc;" style="font-family:Myriad Pro,arial,tahoma,serif;color:#fff;font-size:14px;text-decoration:none;font-weight:bold" title="Confirm tenant creation" target="_blank">
                            <div style="font-family:'Lucida Grande',sans-serif;border-radius:5px;width:120px;min-height:40px;line-height:40px;border:1px solid #577e15;color:#fff;text-align:center;background:#e77431;margin:15px 0 15px">
                                Confirm
                            </div>
                        </a>

而且我只需要使用regexp的href值提取：

https://host-test.com/create?userName=test3&user-mail=myemail@gmail.com&id=14b72820-3855-4f2b-9a39-543ced6784a0&downloadurl=https://host-test.com:443/123/rest/tmp-z7vvymo3wmfzke/vfs/v2/downloadzip/&projectid=d29ya3NwYWNleXFpYXlwZjgwb2sxNDA2MjovY3JlYXRlQWNj:createAcc;

每次的href值也可以不同，可以更长或更短