我的正则表达式检测字符串中的URL的问题？ [英] issues with my regex to detect urls in a string?

问题描述

致以问候。
我使用以下正则表达式来检测字符串
中的url并将它们包装在< a>标签

Greetings all. I am using the following regex to detect urls in a string and wrap them inside the < a > tag

public static String detectUrls(String text) {

        String newText = text
                .replaceAll("(?:https?|ftps?|http?)://[\\w/%.-?&=]+",
                        "<a href='$0'>$0</a>").replaceAll(
                        "(www\\.)[\\w/%.-?&=]+", "<a href='http://$0'>$0</a>");
        return newText;
    }

我有一个问题，即未正确检测到以下链接：
i对正则表达式不太好，所以请指教。

i have a problem that the following links are not detected correctly: i am not that good with regex, so please advise.

http://code.google.com/p/shindig-dnd/

http://confluence.atlassian.com/display/GADGETDEV/Gadgets+and+JIRA+Portlets

www.liferay.com/web/raymond.auge/blog /

www.liferay.com/web/raymond.auge/blog/

（www.opensocial.org/）

(www.opensocial.org/)

http://www.google.com

推荐答案

你遇到的问题是你在角色中使用 - group（ [] ）没有转义它，用于定义范围 .-？（即字符 ./ 0123456789：;< => ？）。要么转义它 \\ - ，要么将它放在字符类的末尾，这样它就不会完成一个范围。

The problem you have is that you are using - within a character group ([]) without escaping it, which is being used to define the range .-? (i.e. the characters ./0123456789:;<=>?). Either escape it \\- or put it at the end of the character class so that it doesn't complete a range.

public static String detectUrls(String text) {
    String newText = text
            .replaceAll("(?:https?|ftps?|http?)://[\\w/%.\\-?&=]+",
                    "<a href='$0'>$0</a>").replaceAll(
                    "(www\\.)[\\w/%.\\-?&=]+", "<a href='http://$0'>$0</a>");
    return newText;
}

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