Question

在这一个小时，有人可以帮忙吗？

尝试匹配以便从这种输入中获取一个网址：

www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htmwww.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htmwww.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htmwww.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm

取自文本框。

<form action="" method="post">
    <textarea name="urls"></textarea>
    <input type="submit">
</form>
<?php
if(preg_match("/[^www]{3}.[a-zA-Z0-9\/\._]+\/\.htm$/", $_POST['urls'], $matches))
{
    echo 'yay';
}

?>

我想从preg_match得到的是：www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm

Answer 1

您可以使用这个简单的正则表达式：

w{3}.+htm

整个命令：

preg_match("/w{3}.+htm/", $_POST['urls'], $matches)

Online Test

Answer 2

尝试：preg_match("/^w{3}.[a-zA-Z0-9\/\._]+\.htm$/", $_POST['urls'], $matches)

Answer 3

您可以使用正则表达式进行拆分：

$links = preg_split("/(?=www\.)/", "www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htmwww.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htmwww.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htmwww.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm");
print_r($links);

(?=www\.)是lookahead assertion，当有“www”时会匹配。在字符串中前进。

输出：

Array ( [0] => [1] => www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm 
               [2] => www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm 
               [3] => www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm 
               [4] => www.4shared.com/video/UryixZ7l/Puppy_loves_ringtones.htm )

Answer 4

尝试：

(w{3}.+?\.htm)

See it in action

匹配正则表达式不起作用

4 个答案: