preg_match(): Compilation failed

Hello I am new to codeigniter forum. And I am also a new user of code igniter MVC platform. Last couple of day I have encountered a problem.. Is there anyone can help me to resolve this.


A PHP Error was encountered
Severity: Warning

Message: preg_match(): Compilation failed: missing ) at offset 16

Filename: core/Router.php

Line Number: 399

Backtrace:

File: C:\xampp\htdocs\ciblog\index.php
Line: 315
Function: require_once