javascript - webpack错误无效的正则表达式：：无效的组

Question

运行 npm run build 时 webpack 给我一个错误。这是错误：

Invalid regular expression: /(?<=\.)(.*?)(?=\.)/: Invalid group (2391:33)
|                     };
|                 } else if (this.runFlag === true) {
|                     var regex = /(?<=\.)(.*?)(?=\.)/g;
                let redirectRegex =
                    this.hostToRegex.length > 0
                        ? this.hostToRegex.map(x => x.match(regex))
                        : null;

标签： javascriptregexwebpack