正则表达式不返回任何与所使用的表达式无关的匹配项 [英] Regex not returning any matches independent of expression used
本文介绍了正则表达式不返回任何与所使用的表达式无关的匹配项的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
好,这是问题所在,我一直在尝试构建cURL脚本来检查数据库中的无效链接.链接都看起来像这样的http://www.ltblekinge.se/download/18.9c16a31109c04a3e880003750
.我遇到的问题是,我使用$url_list
的正则表达式模式"没有任何内容.任何帮助将不胜感激!
Ok here is the issue, I have been trying to build cURL script to check for dead links in a database. The links all look something like this http://www.ltblekinge.se/download/18.9c16a31109c04a3e880003750
. The issue that I have is that no mater what regex "pattern" I use the $url_list
remains empty. Any help would be appreciated!
代码的问题部分
<?php
/*Config*/
/*** mysql hostname ***/
$hostname = 'localhost';
/*** mysql username ***/
$username = 'root';
/*** mysql password ***/
$password = 'root';
/*curl setup of varibles*/
$excluded_domains = array(
'localhost', 'rollnstroll.se');
$max_connections = 10;
$url_list = array();
$working_urls = array();
$dead_urls = array();
$not_found_urls = array();
$active = null;
try {
$dbh = new PDO("mysql:host=$hostname;dbname=blankett", $username, $password);
$dbh->exec('SET CHARACTER SET utf8');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
/*** fetch into an PDOStatement object ***/
$sql = "SELECT * FROM `forms2`";
$stmt = $dbh->prepare("SELECT * FROM forms2");
$stmt->execute();
while ($d = $stmt->fetchAll()) {
if (preg_match_all('/((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[.\!\/\\w]*))?)/', $d['link_forms'], $matches)) {
/***error code***/
if (preg_last_error() == PREG_NO_ERROR) {
print 'There is no error.';
}
else if (preg_last_error() == PREG_INTERNAL_ERROR) {
print 'There is an internal error!';
}
else if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
print 'Backtrack limit was exhausted!';
}
else if (preg_last_error() == PREG_RECURSION_LIMIT_ERROR) {
print 'Recursion limit was exhausted!';
}
else if (preg_last_error() == PREG_BAD_UTF8_ERROR) {
print 'Bad UTF8 error!';
}
else if (preg_last_error() == PREG_BAD_UTF8_ERROR) {
print 'Bad UTF8 offset error!';
}
foreach ($matches[1] as $url) {
// exclude some domains
$tmp = parse_url($url);
if (in_array($tmp['host'], $excluded_domains)) {
continue;
}
// store the url
$url_list []= $url;
}
}
}
// remove duplicates
$url_list = array_values(array_unique($url_list));
if (!$url_list) {
die('No URL to check');
}
}
catch(PDOException $e)
{
echo $e->getMessage();
}
数据库结构
1 id int(10) No None AUTO_INCREMENT
2 master_id int(10) No None
3 name_form varchar(500) latin1_swedish_ci No None
4 link_form varchar(500) latin1_swedish_ci No None
5 date_added timestamp No CURRENT_TIMESTAMP
问题
为什么$url_list
为空?
推荐答案
这对我有用:
$url="http://www.ltblekinge.se/download/18.9c16a31109c04a3e880003750 http://one.com www.two.com http://yourad.io";
preg_match_all('/((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[.\!\/\\w]*))?)/', $url, $matches);
print_r($matches[1]);
输出:
Array
(
[0] => http://www.ltblekinge.se/download/18.9c16a31109c04a3e880003750
[1] => http://one.com
[2] => www.two.com
[3] => http://yourad.io
)
检查您的$d['link_forms']
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