检查字符串是单个URL还是TEXT(可能包含url)的最简单,最快的方法是什么

可能的情况：

// successful scenario
$example[] = 'http://sub-domain.my-domain.com/folder/file.php?some=param';
// successful scenario
$example[] = '/assets/scripts/jquery.min.js?v=1.4';
// successful scenario
$example[] = 'jquery.min.js';
// this scenario should fail validation
$example[] = "http://www.domain.com welcome text\n and some other http://www.domain.com";
// this scenario should fail validation
$example[] = "scriptVar=50;";

我尝试使用本机php函数,例如parse_url,filter_var,但它们都不如预期那样工作.

更新1

为了更加清楚,我试图将可能的URI与将作为DOM元素插入的脚本内容分开.所有网址都将作为SRC属性,其余作为内容,例如：

<script type="text/javascript" src="{$string}"></script>
<script type="text/javascript">{$string}</script>

更新2
通过分析可能的内容,我得出结论,包含空格字符或分号的字符串表示该字符串不能为URI,我认为此模式可以解决我的问题：

preg_match('/[\s]|[;]/', $string);

它会覆盖所有可能的javascript / css代码吗？

解决方法:

$exampleData = Array(
    'http://sub-domain.my-domain.com/folder/file.php?some=param',
    '/assets/scripts/jquery.min.js?v=1.4',
    '<a href="/assets/scripts/jquery.min.js?v=1.4">',
    '<a href="assets/scripts/jquery.min.js?v=1.4">',
    'http://www.domain.com welcome text\n and some other http://www.domain.com',
);

foreach($exampleData as $example)
{
    echo "Trying \"" . $example . "\" -> ";

    echo (preg_match('%((http(s)?://|www\.)[^ \r\n]+|<a.+?href=(\'|")(http(s)?://|www\.|[^#])[^\4\r\n]*?\4.*?>)%i', $example)) ?
     "Match" : "No match";

    echo "\r\n";
}

这将产生：

Trying "http://sub-domain.my-domain.com/folder/file.php?some=param" -> Match
Trying "/assets/scripts/jquery.min.js?v=1.4" -> No match
Trying "<a href="/assets/scripts/jquery.min.js?v=1.4">" -> Match
Trying "<a href="assets/scripts/jquery.min.js?v=1.4">" -> Match
Trying "http://www.domain.com welcome text\n and some other http://www.domain.com" -> Match

更新：

阅读完您的最新更新.如果要解析HTML.使用如下的DOM解析器：

http://simplehtmldom.sourceforge.net/

例：

include_once('simple_html_dom.php');

$dom = file_get_html('http://www.*.com/');

foreach($dom->find('script') as $scriptElement)
{
    if(strlen(trim($scriptElement->src)) > 0)
    {
        // Script with URI set
        echo "<strong>Found script with URI</strong>";
        echo "<p>" . $scriptElement->src . "</p>";
    }
    else
    {
        // Script with content
        echo "<strong>Found script with content</strong>";
        echo("<p>" . nl2br(htmlspecialchars($scriptElement->innertext)) . "</p>");
    }
}

将输出类似(HTML剥离)的内容：

Found script with URI
http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js

Found script with URI
http://sstatic.net/js/master.min.js?v=afc76d4deac3

Found script with content    
var imagePath='http://sstatic.net/*/img/';
var inboxUnviewedCount = -1;

...etc