C#Regex.Replace

Question

这是我在richtextbox1里面的字符串集..

/Category/5
/Category/4
/Category/19
/Category/22
/Category/26
/Category/27
/Category/24
/Category/3
/Category/1
/Category/15
http://example.org/Category/15/noneedtoadd

我想用" http://example.com/ "之类的网址更改所有的起始"/ "

输出:

http://example.com/Category/5
http://example.com/Category/4
http://example.com/Category/19
http://example.com/Category/22
http://example.com/Category/26
http://example.com/Category/27
http://example.com/Category/24
http://example.com/Category/3
http://example.com/Category/1
http://example.com/Category/15
http://example.org/Category/15/noneedtoadd

只是问,那是什么模式？:)

Answer 1

这里不需要正则表达式.遍历列表中的项目并用于String.Format构建所需的URL.

String.Format(@"http://example.com{0}", str);

如果要在预先添加字符串之前检查该文本框中的某个项是否为完整格式的URL,请使用String.StartsWith(doc).

if (!String.StartsWith("http://")) { 
    // use String.Format 
}