정규표현식 문법

정규표현식을 사용하는 함수 

자주 사용되는 함수들

// 도메인 유효성 검증

$url = "http://www.naver.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.";

}

// 특정 문자의 강조

$text = preg_replace("/b(강조할문자)b/i", '<span style="background:#5fc9f6">1</span>', $text);

echo $text;

// 검색어에 효과주기

$title  = get_the_title();

$keys= explode(" ",$s);

$title  = preg_replace('/('.implode('|', $keys) .')/iu',

'<strong class="search-excerpt">\0</strong>', $title);

// 문서에 삽입된 모든 이미지 추출

$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);

}

}

// 반복 입력된 단어 제거

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

// 반복 입력된 부호 제거

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

// XML/HTML 태그 추출

function get_tag( $tag, $xml ) {

  $tag = preg_quote($tag);

  preg_match_all('{<'.$tag.'[^>]*>(.*?)</'.$tag.'>.'}',

                   $xml,

                   $matches,

                   PREG_PATTERN_ORDER);

  return $matches[1];

}

// 특정 속성을 포함하는 XML/HTML 태그 추출

function get_tag( $attr, $value, $xml, $tag=null ) {

  if( is_null($tag) )

    $tag = '\w+';

  else

    $tag = preg_quote($tag);

  $attr = preg_quote($attr);

  $value = preg_quote($value);

  $tag_regex = "/<(".$tag.")[^>]*$attr\s*=\s*".

                "(['\"])$value\\2[^>]*>(.*?)<\/\\1>/"

  preg_match_all($tag_regex,

                 $xml,

                 $matches,

                 PREG_PATTERN_ORDER);

  return $matches[3];

}

// 16진수 컬러값 체크

$string = "#555555";

if (preg_match('/^#(?:(?:[a-fd]{3}){1,2})$/i', $string)) {

echo "example 6 successful.";

}

// 웹페이지의 타이틀 추출

$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);

// 아파치 로그 파싱

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

// 겹따옴표를 홑따옴표로 교체

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

// 비밀번호 완성도 체크

//Tests if the input consists of 6 or more letters, digits, underscores and hyphens.

//The input must contain at least one upper case letter, one lower case letter and one digit.

'\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 이미지 표시

<?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;

?>

// 특정 이모티콘을 이미지로 교체

$texte='A text with a smiley :-)';

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