基础
http://deerchao.net/tutorials/regex/regex.htm#metacode
完善匹配中文的Php正则表达式
http://www.php100.com/html/webkaifa/zhengzebiaodashi/2011/0213/7513.html
php提供的原生处理编码的正则
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
$string=" （包含首月600分钟区内语音、300M流量、100条短信、免6元手机邮箱）";
mb_regex_encoding("UTF-8");
mb_ereg_search_init($string);
//mb_ereg_search("(d+)(分钟|M|条|元)");
echo "<pre>";
while($match = mb_ereg_search_regs ("(d+)(分钟|M|条|元)([^、）]+)")){
var_export($match);
};
exit;
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><pre><?php
// 零宽断言,需要理解的是间隙
//特别注意零，这种是间隙，表示匹配但不包括
preg_match_all("/ab(?=c)/", "abc abd",$data);
print_r($data);
/**
* Array
(
[0] => Array
(
[0] => ab
)
)
*/
//间隙后不是什么
preg_match_all("/ab(?!c)/", "abc abd",$data);
print_r($data);
/**
* Array
(
[0] => Array
(
[0] => ab
)
)
*/
//括号不包括
preg_match_all("/ab(?:c)/", "abc abd",$data);
print_r($data);
/**
* //这个和上面是没有关系的，只是顺便做补充
Array
(
[0] => Array
(
[0] => abc
)
)
*/
//包括间隙
preg_match_all("/ab(?>c)/", "abc abd",$data);
print_r($data);
echo "负向0宽断言<BR>";
preg_match_all("/(?<=c)ab/", "cab dab",$data);
print_r($data);
/**
* Array
(
[0] => Array
(
[0] => ab
)
)
*/
preg_match_all("/(?<=c)ab/", "<=cab dab",$data);
print_r($data);
/**
* Array
(
[0] => Array
(
[0] => <=cab
)
)
*/
preg_match_all("/(?<!c)ab/", "<=cab dab",$data);
print_r($data);
/**
* Array
(
[0] => Array
(
[0] => <=dab
)
)
*/
preg_match_all("/(?:<=c)ab/", "<=cab dab",$data);
print_r($data);
/**
* Array
(
[0] => Array
(
[0] => <=cab
)
)
*/
exit;
匹配多个不相同字正则 ，有人说无解呀~
$s = "abcd1231daaa23abcxde23abcdeef3abcdefg3abcdefgh3abcdefghi3abccdefghij";
$flag = preg_match_all ( '/([a-z])(?!1)([a-z])(?!1|2)([a-z])(?!1|2|3)([a-z])(?!1|2|3|4)([a-z])(?!1|2|3|4|5)([a-z])/', $s, $result );
var_export ( $flag );
var_export ( $result );
/**
* array (
* 0 => 'abcdef',
* 1 => 'abcdef',
* 2 => 'abcdef',
* 3 => 'abcdef',
* 4 =>'cdefgh', )
*/
补充替换反斜杠 =>
$value=preg_replace("/\\/", "", $value);