我希望能够查找文本中所有类似于这样的链接：
Test text http://hello.world Test text
http://google.com/file.jpg Test text https://hell.o.wor.ld/test?qwe=qwe Test text
test text http://test.test/test
我建议使用简单的正则表达式：~[a-z]+://\S+~i
因此，它可以看起来像这样：
$pattern = '~[a-z]+://\S+~';
$str = 'Test text http://hello.world Test text
http://google.com/file.jpg Test text https://hell.o.wor.ld/test?qwe=qwe Test text
test text http://test.test/test';
if($num_found = preg_match_all($pattern, $str, $out))
{
echo "FOUND ".$num_found." LINKS:\n";
print_r($out[0]);
}
输出:
FOUND 4 LINKS:
Array
(
[0] => http://hello.world
[1] => http://google.com/file.jpg
[2] => https://hell.o.wor.ld/test?qwe=qwe
[3] => http://test.test/test
)
function turnUrlIntoHyperlink($string){
//The Regular Expression filter
$reg_exUrl = "/(?i)\b((?:https?:\/\/|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'\".,<>?«»“”‘’]))/";
// Check if there is a url in the text
if(preg_match_all($reg_exUrl, $string, $url)) {
// Loop through all matches
foreach($url[0] as $newLinks){
if(strstr( $newLinks, ":" ) === false){
$link = 'http://'.$newLinks;
}else{
$link = $newLinks;
}
// Create Search and Replace strings
$search = $newLinks;
$replace = '<a href="'.$link.'" title="'.$newLinks.'" target="_blank">'.$link.'</a>';
$string = str_replace($search, $replace, $string);
}
}
//Return result
return $string;
}
转换URL为超链接的函数
function turnUrlIntoHyperlink($string) { // 正则表达式过滤器 $reg_exUrl = "/(http|https|ftp|ftps)://[a-zA-Z0-9-.]+.[a-zA-Z]{2,3}(/\S*)?/";
// Check if there is a url in the text
if (preg_match($reg_exUrl, $string, $url)) {
// make the urls hyper links
echo preg_replace($reg_exUrl, "<a target='_blank' href='{$url[0]}'>{$url[0]}</a>", $string);
} else {
// if no urls in the text just return the text
echo $string;
}
}
<?php
// The Regular Expression filter
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";
// The Text you want to filter for urls
$text = "The text you want to filter goes here. http://google.com";
// Check if there is a url in the text
if(preg_match($reg_exUrl, $text, $url)) {
// make the urls hyper links
echo preg_replace($reg_exUrl, "<a href="{$url[0]}">{$url[0]}</a> ", $text);
} else {
// if no urls in the text just return the text
echo $text;
}
?>
Reference:http://css-tricks.com/snippets/php/find-urls-in-text-make-links/
非常好用，建议使用。
$str= "Test text http://hello.world";
preg_match_all('/\b(?:(?:https?|ftp|file):\/\/|www\.|ftp\.)[-A-Z0-9+&@#\/%=~_|$?!:,.]*[A-Z0-9+&@#\/%=~_|$]/i', $str, $result, PREG_PATTERN_ORDER);
print_r($result[0]);
www。的情况，另一个则遗漏了http://。$text = Test text http://hello.world Test text
http://google.com/file.jpg Test text https://hell.o.wor.ld/test?qwe=qwe Test text
test text http://test.test/test
preg_match_all('/(((http|https|ftp|ftps)\:\/\/)|(www\.))[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\:[0-9]+)?(\/\S*)?/', $text, $results, PREG_PATTERN_ORDER);
print_r($results[0]);
PREG_PATTERN_ORDER 的返回值是数组的数组 (results)，因此 $results[0] 是包含完整匹配模式的数组，$results[1] 是由第一个括号分组子模式匹配的字符串数组，以此类推。
如果要将URL转换为标签，并识别没有http/https的URL，请尝试以下方法。它使用preg_replace_callback来避免其他答案中出现同一URL多次的问题：
private function convertUrls($string) {
$url_pattern = '/(((http|https)\:\/\/)|(www\.))[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,}(\:[0-9]+)?(\/\S*)?/';
return preg_replace_callback($url_pattern,
function($matches) {
$match = $matches[0];
if (strstr($match, ":") === false) {
$url = "https://$match";
} else {
$url = $match;
}
return '<a href="' . $url .'" target="_blank">' . $url . '</a>';
},
$string);
}
http 还是 www 开头，而且无论文本中链接出现了多少次。非常感谢！ - Kida正则表达式的替代方案是使用库。
它的效果非常好，但对于非常复杂的代码可能不太适用。
foreach($html->find('a') as $element)
echo $element->href . '<br>';
易于使用。无需正则表达式技能:-)
a标签。 - HamZa$txt = "Test text http://hello.world Test text
http://google.com/file.jpg Test text https://hell.o.wor.ld/test?qwe=qwe Test text
test text http://test.test/test <a href=\"http://example.com\">I am already linked up</a>
It was also done in 1927 (http://test.com/reference) Also check this out:http://test/index&t=27";
$holder = explode("http",$txt);
for($i = 1; $i < (count($holder));$i++) {
if (substr($holder[$i-1],-6) != 'href="') { // this means that the link is not alread in an a tag.
if (strpos($holder[$i]," ")!==false) //if the link is not the last item in the text block, stop at the first space
$href = substr($holder[$i],0,strpos($holder[$i]," "));
else //else it is the last item, take it
$href = $holder[$i];
if (ctype_punct(substr($holder[$i-1],strlen($holder[$i-1])-1)) && ctype_punct(substr($holder[$i],strlen($holder[$i])-1)))
$href = substr($href,0,-1); //if both the fron and back of the link are encapsulated in punctuation, truncate the link by one
$holder[$i] = implode("$href\" target=\"_blank\" class=\"link\">http$href</a>",explode($href,$holder[$i]));
$holder[$i-1] .= "<a href=\"";
}
}
$txt = implode("http",$holder);
echo $txt;
输出：
Test text <a href="http://hello.world" target="_blank" class="link">http://hello.world</a> Test text
<a href="http://google.com/file.jpg" target="_blank" class="link">http://google.com/file.jpg</a> Test text <a href="https://hell.o.wor.ld/test?qwe=qwe" target="_blank" class="link">https://hell.o.wor.ld/test?qwe=qwe</a> Test text
test text <a href="http://test.test/test" target="_blank" class="link">http://test.test/test</a> <a href="http://example.com">I am already linked up</a>
It was also done in 1927 (<a href="http://test.com/reference" target="_blank" class="link">http://test.com/reference</a>) Also check this out:<a href="http://test/index&t=27" target="_blank" class="link">http://test/index&t=27</a>
<?php
function deteli($string){
$pos = strpos($string, 'http');
$spos = strpos($string, ' ', $pos);
$lst = $spos - $pos;
$bef = substr($string, 0, $pos);
$aft = substr($string, $spos);
if ($pos == true || $pos == 0) {
$link = substr($string, $pos, $lst);
$res = $bef . "<a href='" . $link . "' class='link' target='_blank'>link</a>" . $aft . "";
return $res;
}
else{
return $string;
}
}?>
(?:https?|ftp)://\S+，注意\S+表示匹配一个或多个非空白字符。 - HamZa(?:)是一个非捕获组，查看这里 并将 这个参考资料 添加到书签或收藏夹中。 - HamZa