常用正则

1.使用正则表达式删除

1	$text = preg_replace('/\r\n|\r|\n/','',$text);

2.删除使用字符串功能

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$text = str_replace(array("\r\n","\r","\n"),'',$text); 또는 $text = strtr($text,array("\r\n"=>'',"\r"=>'',"\n"=>''));

 

删除html标签

 

1	$content = preg_replace("(\<(/?[^\>]+)\>)", "", $content);

 

 

删除textarea

1 2	$content = preg_replace("!<textarea(.*?)>!is","[textarea]",$content); $content = preg_replace("!</textarea(.*?)>!is","[/textarea]",$content);

删除脚本

1	$str=preg_replace("!<script(.*?)<\/script>!is","",$str);

删除iframe

1	$str=preg_replace("!<iframe(.*?)<\/iframe>!is","",$str);

元删除

1	$str=preg_replace("!<meta(.*?)>!is","",$str);

删除样式标记

1	$str=preg_replace("!<style(.*?)<\/style>!is","",$str);

＆nbsp;到空白

1	$str=str_replace(" "," ",$str);

有一个连续的空间

1	$str=preg_replace("/\s{2,}/"," ",$str);

删除标签内的style =属性

1 2	$str=preg_replace("/ zzstyle=([^\"\']+) /"," ",$str); // style=border:0 따옴표가 없을때 $str=preg_replace("/ style=(\"|\')?([^\"\']+)(\"|\')?/","",$str); // style="border:0" 따옴표 있을때

  
删除标签width =，height = attribute

1 2	$str=preg_replace("/ width=(\"|\')?\d+(\"|\')?/","",$str); $str=preg_replace("/ height=(\"|\')?\d+(\"|\')?/","",$str);

img extract标签src提取

1 2	preg_match("/<img[^>]*src=[\"']?([^>\"']+)[\"']?[^>]*>/i",$str,$result); preg_match_all("/<img[^>]*src=[\"']?([^>\"']+)[\"']?[^>]*>/i",$str,$result);

 

 

删除特殊字符

1	$string = preg_replace("/[ #\&\+\-%@=\/\\\:;,\.'\"\^`~\_|\!\?\*$#<>()\[\]\{\}]/i", "", $string);

删除空格

1 2	$string = preg_replace('/ /', '', $string); $string = preg_replace("/\s+/", "", $string);

删除重复输入的单词

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

删除重复输入的标志

1	$string = preg_replace("/.+/i", ".", $string);

删除除字母字符以外的所有字符

1	$string = preg_replace("/[^A-Za-z]/", "", $string);

删除除字母字符和空格字符（空格）以外的所有字符

1	$string = preg_replace("/[^A-Za-z|\x20]/", "", $string);

ASCII类别代码删除除英语+特殊字符外的所有字符

1	$string = preg_replace("/[^\x20-\x7e]/", "", $string);

提取img标签

1 2	preg_match_all("/<img[^>]*src=[\'\"]?([^>\'\"]+)[\'\"]?[^>]*>/", $img, $matchs); print_r($matchs);