golang正则关于<?=的替代

Question

golang正则报错

<?php
/**
 * Created by PhpStorm.
 * User: admin
 * Date: 2018/8/21
 * Time: 15:06
 */

namespace app\admino\controller;


use app\common\model\AdminModel;
use app\common\model\BannerModel;
use app\common\model\ClientModel;
use app\common\model\LogerModel;
use app\common\model\SignModel;
use app\common\model\SmsModel;
use app\common\model\SystemModel;
use app\common\model\TagModel;
use app\common\model\UserModel;
use app\common\model\WechatOfficialAccountModel;
use think\db\Query;
use think\Exception;
use think\Log;
use think\Session;

class UserExt extends SingleTableBase
{
    protected $model = "user";
    protected $primary_show = false;
    protected $title = "门店会员管理";
    protected $is_edit = false;
    protected $is_add = false;
    protected $is_del = false;
    protected $is_show = false;
    protected $is_export=true;
    protected $index_view = "/UserExt/index";
    protected $table_header = [
        "created_at" => "注册日期",
        "user_id" => "客户编号",
        "username" => "客户姓名",
        "gender" => "性别",
        "phone" => "联系电话",
        "openid"=>"openid",
        "content" => "影像文件下载链接",
        "share_time" => "分享链接日期",
    ];
    protected $filter_header = ["created_at", "share_time"];
    protected $table_option = [
        "gender" => [
            'type' => self::TYPE_SELECT,
            'data' => [1 => "先生", 2 => "女士"],
        ],
        "created_at" => [
            'type' => self::TYPE_TIME,
        ],
        "share_time" => [
            'type' => self::TYPE_TIME,
        ],
    ];
    protected $table_ext_button = [];
    protected $search_header = ["phone", "username"];

    protected function data(Query $model, $page, $search, $filter = false, $w = [])
    {
        if (empty($_REQUEST["filter"]) && empty($_REQUEST["search"])) {
            $model->where(["id" => "999999999"]);
        }
        $admin_info = AdminModel::getInstance()->where(["id" => Session::get("user")["user_id"]])->find();
        $w["business_id"] = $admin_info["business_id"];
        $data = parent::data($model, $page, $search, $filter, $w); // TODO: Change the autogenerated stub
        for ($i = 0; $i < count($data["data"]); $i++) {
            $data["data"][$i]["user_id"] = $data["data"][$i]["business_id"] . "-" . $data["data"][$i]["user_number"];
        }
        return $data;
    }

    protected function saveDataFilter(&$data)
    {
        $data["type"] = $_REQUEST["type"];
        parent::saveDataFilter($data); // TODO: Change the autogenerated stub
    }

    public function updateContent($id, $content)
    {
        $user_info = UserModel::getInstance()->where(["id" => $id])->find();
        $admin_info = AdminModel::getInstance()->where(["business_id" => $user_info["business_id"]])->find();
        $array = [1 => "先生", 2 => "女士"];
        if ($admin_info["type"] == 0) {
            $sms_name = SignModel::getInstance()->where(["id" => $admin_info["sms_id"]])->find()["ems_sign"];
            $msg = "【{$sms_name}】尊敬的：{$user_info["username"]}{$array[$user_info["gender"]]}！您的影像文件可以下载了，请您务必于7天内扫描二维码或通过公众号登录下载，并妥善保存，谢谢！";
            try {
                SystemModel::sendCode($user_info["phone"], $msg);
                SmsModel::getInstance()->add(["title" => "影像下载通知", "business_id" => Session::get("user")["business_id"], "user_name" => $admin_info["name"], "phone" => $user_info["phone"], "content" => $msg, "username" => $admin_info["username"], "name" => $user_info["username"], "business_sms_name" => $admin_info["business_sms_name"]]);
                UserModel::getInstance()->where(["id" => $id])->save(["content" => $content, "share_time" => date("Y-m-d H:i:s")]);
            } catch (Exception $exception) {
                $this->displayByError($exception->getMessage());
            }
            $this->displayBySuccess();
        }
        if ($user_info["is_bind"] == 1) {
            $this->displayByError("用户已解绑，无法推送");
        }
        if(empty($user_info["openid"])){
            $this->displayByError("用户openid为空");
        }
        UserModel::getInstance()->where(["id" => $id])->save(["content" => $content, "share_time" => date("Y-m-d H:i:s")]);
        $push_log = WechatOfficialAccountModel::sendMessage($user_info["openid"], $user_info["business_id"], "template_one",
            "https://{$_SERVER['HTTP_HOST']}/Api/Login/download.html?id={$user_info["business_id"]}", "尊敬的{$user_info["username"]}{$array[$user_info["gender"]]},您的影像文件已经可以下载了，请您务必于7天内，点击本条信息“查看详情”登录下载，并妥善保存。", [$user_info["phone"], date("Y-m-d H:i:s")], "下载影像时，请先将整个文件夹保存到您的网盘，再登录您的网盘将文件下载到您的手机或电脑。可能有些文件在您的网盘里不能直接预览缩略图，这属于正常现象，请您先将文件下载到您的手机或电脑里，再从手机或电脑里打开文件就可以了，感谢您的配合");
        LogerModel::addLog("push_log", json_encode($push_log));
        $this->displayBySuccess();
    }

    public function search()
    {
        $this->displayByData([], "UserExt/search");
    }
}

相关代码

r, e := regexp.Compile("(?<=class\\s)[^\\s]+")
                                    fmt.Println("错误信息",e)
                                    class_name:=r.FindString(line)
                                    fmt.Println("class的值",class_name)

异常

错误信息 error parsing regexp: invalid or unsupported Perl syntax: `(?<`
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x18 pc=0x6580c6]

goroutine 1 [running]:
regexp.(*Regexp).doExecute(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0000e1b50, 0x7, 0x0, 0x2, ...)
    C:/Go/src/regexp/exec.go:527 +0x76
regexp.(*Regexp).FindString(0x0, 0xc0000e1b50, 0x7, 0x2, 0x2)
    C:/Go/src/regexp/regexp.go:786 +0xb0
main.ReadPhp(0xc000110000, 0x2, 0x4)
    C:/Users/lq/OneDrive/yueyingyunhuiyuanxitong/main.go:113 +0x58c
main.main()
    C:/Users/lq/OneDrive/yueyingyunhuiyuanxitong/main.go:65 +0x149

Process finished with exit code 2

Answer 1

golang正则不支持环视语法，但你可以用捕获组的方式去处理

\bclass\s(\w+)

然后获取捕获组group1就是class的值了

测试文本发这里

Answer 2

经过正则表达式在线工具测试无法匹配到