//获取连接的正则 
var pattern = /(https?|ftp|file):\/\/[-A-Za-z0-9+&@#\/%?=~_|!:,.;]+[-A-Za-z0-9+&@#\/%=~_|]/g; 
//获取文本框中的文本 
var content = $("#content").val(); 
//将文本中匹配的内容替换 
var thinkContent = content.replace(pattern,"https://a.nonot.cn/123456");