用于 URL 匹配的正则表达式 (PCRE)

问题描述

输入:我们得到一些纯文本作为输入字符串，我们必须使用 <a href={url}>{url></a> 突出显示所有 URL.

The input: we get some plain text as input string and we have to highlighight all URLs there with <a href={url}>{url></a>.

一段时间以来，我使用了取自 http://flanders.co.nz/2009/11/08/a-good-url-regular-expression-repost/，我修改了几次，但它是为另一个问题而构建的 -检查整个输入字符串是否为 URL.

For some time I've used regex taken from http://flanders.co.nz/2009/11/08/a-good-url-regular-expression-repost/, which I modified several times, but it's built for another issue - to check whether the whole input string is an URL or no.

那么，您在此类问题中使用什么正则表达式?

So, what regex do you use in such issues?

UPD:如果答案与 php 相关就好了 :-[

UPD: it would be nice if answers were related to php :-[

推荐答案

看看 CPAN 上可用的几个模块:

Take a look at a couple of modules available on CPAN:

• URI::Find
• URI::Find::Schemeless

后者更宽容一点.源代码中提供了正则表达式 (后者的，例如).

where the latter is a little more forgiving. The regular expressions are available in the source code (the latter's, for example).

例如:

#! /usr/bin/perl

use warnings;
use strict;

use URI::Find::Schemeless;

my $text = "http://stackoverflow.com/users/251311/zerkms is swell!\n";

URI::Find::Schemeless
  ->new(sub { qq[<a href="$_[0]">$_[0]</a>] })
  ->find(\$text);

print $text;

输出:

<a href="http://stackoverflow.com/users/251311/zerkms">http://stackoverflow.com/users/251311/zerkms</a> is swell!

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