15个实用的PHP正则表达式

下面是脚本之家 jb51.cc 通过网络收集整理的代码片段。

脚本之家小编现在分享给大家，也给大家做个参考。

$url = "http://komunitasweb.com/"; 
if (preg_match('/^(http|https|ftp)://([A-Z0-9][A-Z0-9_-]*(?:.[A-Z0-9][A-Z0-9_-]*)+):?(d+)?/?/i',$url)) { 
  echo "Your url is ok."; 
} else { 
  echo "Wrong url."; 
}

$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;

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; }

$images = array(); 
preg_match_all('/(img|src)=("|')[^"'>]+/i',$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); 
  } 
}

$text = preg_replace("/s(w+s)1/i","$1",$text);

$text = preg_replace("/.+/i",".",$text);

function get_tag( $tag,$xml ) { 
 $tag = preg_quote($tag); 
 preg_match_all('{<'.$tag.'[^>]*>(.*?)</'.$tag.'>.'}',$xml,$matches,PREG_PATTERN_ORDER); 

 return $matches[1]; 
}

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]; 
}

$string = "#555555"; 
if (preg_match('/^#(?:(?:[a-fd]{3}){1,2})$/i',$string)) { 
echo "example 6 successful."; 
}

$fp = fopen("http://www.catswhocode.com/blog","r"); 
while (!feof($fp) ){ 
  $page .= fgets($fp,4096); 
} 

$titre = eregi("<title>(.*)</title>",$page,$regs); 
echo $regs[1]; 
fclose($fp);

//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)[^"]*)"$'

preg_replace('B"b([^"x84x93x94rn]+)b"B','?1?',$text);

'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'

<?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; 
?>

$texte='A text with a smiley '; 
echo str_replace(':-)','<img src="smileys/souriant.png">',$texte);

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<?php 
  $str = ' 
    <a href="http://www.jobbole.com/">jobbole</a>其他字符 
    <a href="http://www.sohu.com/">sohu</a> 
    <a href="http://www.sohu.com/"><img src="/uploads/allimg/200514/11045D3F_0.jpg" /></a> 
    <br>'; 

  //echo preg_replace("/(<a.*?>)(<img.*?>)(</a>)/",'$2',$str);  
  echo preg_replace("/(<a.*?>)(<img.*?>)(</a>)/",'2',$str);  
?>

以上是脚本之家(jb51.cc)为你收集整理的全部代码内容，希望文章能够帮你解决所遇到的程序开发问题。

如果觉得脚本之家网站内容还不错，欢迎将脚本之家网站推荐给程序员好友。

（编辑：安卓应用网）

【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!