15个超实用的php正则表达式
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在这篇文章里，我已经编写了15个超有用的正则表达式，WEB开发人员都应该将它收藏到自己的工具包。 验证域名
$url = "http://komunitasweb.com/";
if (preg_match('/^(http|https|ftp)://([A-Z0-9][A-Z0-9_-]*(?:.[A-Z0-9][A-Z0-9_-]*)+):?(d+)?/?/i',$url)) {
echo "Your url is ok.";
} else {
echo "Wrong url.";
}
从一个字符串中 突出某个单词
$text = "Sample sentence from KomunitasWeb,regex has become popular in web programming. Now we learn regex. According to wikipedia,Regular expressions (abbreviated as regex or
regexp,with plural forms regexes,regexps,or regexen) are written in a formal language that can be interpreted by a regular expression processor";
$text = preg_replace("/b(regex)b/i",'<span style="background:#5fc9f6">1</span>',$text);
echo $text;
突出查询结果在你的 WordPress 博客里就像刚才我说的，上面的那段代码可以很方便的搜索出结果，而这里是一个更好的方式去执行搜索在某个WordPress的博客上打开你的文件 search.php ，然后找到 方法 the_title() 然后用下面代码替换掉它
echo $title;
Now,just before the modified line,add this code:
<?php
$title = get_the_title();
$keys= explode(" ",$s);
$title = preg_replace('/('.implode('|',$keys) .')/iu','<strong> </strong>',$title);
?>
Save the search.php file and open style.css. Append the following line to it:
strong.search-excerpt { background: yellow; }
从HTML文档中获得全部图片
$images = array();
preg_match_all('/(img|src)=("|')[^"'>]+/i',$data,$media);
unset($data);
$data=preg_replace('/(img|src)("|'|="|=')(.*)/i',"$3",$media[0]);
foreach($data as $url)
{
$info = pathinfo($url);
if (isset($info['extension']))
{
if (($info['extension'] == 'jpg') ||
($info['extension'] == 'jpeg') ||
($info['extension'] == 'gif') ||
($info['extension'] == 'png'))
array_push($images,$url);
}
}
删除重复字母
$text = preg_replace("/s(w+s)1/i","$1",$text);
删除重复的标点
$text = preg_replace("/.+/i",".",$text);
匹配一个XML或者HTML标签
function get_tag( $tag,$xml ) {
$tag = preg_quote($tag);
preg_match_all('{<'.$tag.'[^>]*>(.*?)</'.$tag.'>.'}',$xml,$matches,PREG_PATTERN_ORDER);
return $matches[1];
}
匹配具有属性值的XML或者HTML标签
function get_tag( $attr,$value,$tag=null ) {
if( is_null($tag) )
$tag = 'w+';
else
$tag = preg_quote($tag);
$attr = preg_quote($attr);
$value = preg_quote($value);
$tag_regex = "/<(".$tag.")[^>]*$attrs*=s*".
"(['"])$value2[^>]*>(.*?)</1>/"
preg_match_all($tag_regex,PREG_PATTERN_ORDER);
return $matches[3];
}
匹配十六进制颜色值
$string = "#555555";
if (preg_match('/^#(?:(?:[a-fd]{3}){1,2})$/i',$string)) {
echo "example 6 successful.";
}
查找页面 title
$fp = fopen("http://www.catswhocode.com/blog","r");
while (!feof($fp) ){
$page .= fgets($fp,4096);
}
$titre = eregi("<title>(.*)</title>",$page,$regs);
echo $regs[1];
fclose($fp);
解释 Apache 日志 //Logs: Apache web server //Successful hits to HTML files only. Useful for counting the number of page views. '^((?#client IP or domain name)S+)s+((?#basic authentication)S+s+S+)s+[((?#date and time)[^]]+)]s+"(?:GET|POST|HEAD) ((?#file)/[^ ?"]+?.html?)??((?#parameters)[^ ?"]+)? HTTP/[0-9.]+"s+(?#status code)200s+((?#bytes transferred)[-0-9]+)s+"((?#referrer)[^"]*)"s+"((?#user agent)[^"]*)"$' //Logs: Apache web server //404 errors only '^((?#client IP or domain name)S+)s+((?#basic authentication)S+s+S+)s+[((?#date and time)[^]]+)]s+"(?:GET|POST|HEAD) ((?#file)[^ ?"]+)??((?#parameters)[^ ?"]+)? HTTP/[0-9.]+"s+(?#status code)404s+((?#bytes transferred)[-0-9]+)s+"((?#referrer)[^"]*)"s+"((?#user agent)[^"]*)"$' 使用智能引号代替双引号
preg_replace('B"b([^"x84x93x94rn]+)b"B','?1?',$text);
检验密码的复杂度 复制代码 代码如下: 'A(?=[-_a-zA-Z0-9]*?[A-Z])(?=[-_a-zA-Z0-9]*?[a-z])(?=[-_a-zA-Z0-9]*?[0-9])[-_a-zA-Z0-9]{6,}z'
WordPress: 使用正则获得 帖子上的图片
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<?php
$szPostContent = $post->post_content;
$szSearchPattern = '~<img [^>]* />~';
// Run preg_match_all to grab all the images and save the results in $aPics
preg_match_all( $szSearchPattern,$szPostContent,$aPics );
// Check to see if we have at least 1 image
$iNumberOfPics = count($aPics[0]);
if ( $iNumberOfPics > 0 ) {
// Now here you would do whatever you need to do with the images
// For this example the images are just displayed
for ( $i=0; $i < $iNumberOfPics ; $i++ ) {
echo $aPics[0][$i];
};
};
endwhile;
endif;
?>
自动生成笑脸图案
$texte='A text with a smiley ';
echo str_replace(':-)','<img src="smileys/souriant.png">',$texte);
移除图片的链接
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
$str = '
<a href="http://www.5idev.com/">5idev</a>其他字符
<a href="http://www.sohu.com/">sohu</a>
<a href="http://www.sohu.com/"><img src="http://www.fashion-press.net/img/news/3176/mot_06.jpg" /></a>
<br>';
//echo preg_replace("/(<a.*?>)(<img.*?>)(</a>)/",'$2',$str);
echo preg_replace("/(<a.*?>)(<img.*?>)(</a>)/",'2',$str);
?>
以上就是15个超实用的php正则表达式，希望对大家的学习有所帮助。 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |