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¿Por qué mi código muestra el error "Expresión regular no válida: falta /"?

Estaba tratando de crear una sala de chat simple usando express y socket.io pero encontré un error mientras ejecutaba el servidor. ¿Alguien puede ayudar?

Servidor.js

 const express = require("express"); const path = require("path"); const app = express(); const server = require("http").createServer(app); const io = require("socket.io")(server); app.use(express.static(path.join(__dirname+"/public"))); io.on("connection", function(socket){ socket.on("newuser",function(username){ socket.broadcast.emit("update", username + " joined the conversation"); }); socket.on("exituser",function(username){ socket.broadcast.emit("update", username + " left the conversation"); }); socket.on("chat",function(message){ socket.broadcast.emit("chat", message); }); }); server.listen(5000);

Después de ingresar node server.js en el símbolo del sistema, veo este error

Mensaje de error:

 app.use(express.static(path.join(__dirname*/public))); ^ SyntaxError: Invalid regular expression: missing / at wrapSafe (internal/modules/cjs/loader.js:1001:16) at Module._compile (internal/modules/cjs/loader.js:1049:27) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10) at Module.load (internal/modules/cjs/loader.js:950:32) at Function.Module._load (internal/modules/cjs/loader.js:790:12) at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12) at internal/main/run_main_module.js:17:47
about 4 years ago · Juan Pablo Isaza
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