从给定字符串中提取 url 的 C# 正则表达式模式 - 不是完整的 html url，而是裸链接

Question

我需要一个正则表达式来执行以下操作

Extract all strings which starts with http://
Extract all strings which starts with www.

所以我需要提取这两个。

例如下面有这个给定的字符串文本

house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue

所以从上面给出的字符串我会得到

    www.monstermmorpg.com
http://www.monstermmorpg.com
http://www.monstermmorpg.commerged

寻找正则表达式或其他方式。谢谢。

C# 4.0

Answer 1

您可以编写一些非常简单的正则表达式来处理这个问题，或者通过更传统的字符串拆分 + LINQ 方法。

正则表达式

var linkParser = new Regex(@"\b(?:https?://|www\.)\S+\b", RegexOptions.Compiled | RegexOptions.IgnoreCase);
var rawString = "house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue";
foreach(Match m in linkParser.Matches(rawString))
    MessageBox.Show(m.Value);

解释图案:

\b       -matches a word boundary (spaces, periods..etc)
(?:      -define the beginning of a group, the ?: specifies not to capture the data within this group.
https?://  - Match http or https (the '?' after the "s" makes it optional)
|        -OR
www\.    -literal string, match www. (the \. means a literal ".")
)        -end group
\S+      -match a series of non-whitespace characters.
\b       -match the closing word boundary.

基本上，该模式会查找以 http://OR https://OR www 开头的字符串。 (?:https?://|www\.) 然后匹配所有字符直到下一个空格。

传统字符串选项

var rawString = "house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue";
var links = rawString.Split("\t\n ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).Where(s => s.StartsWith("http://") || s.StartsWith("www.") || s.StartsWith("https://"));
foreach (string s in links)
    MessageBox.Show(s);