正则纠结中…该如何处理

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Release: 2016-06-13 13:36:24
Original
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正则纠结中……
[^\f\n\r\t\v] \S ,是否真的等同?
去掉[^\f\n\r\t\v],$s2中的空格去不了,加上以后,什么都不匹配……

PHP code
<!--

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-->
function checkString($str){
        //去掉非英文以外的其他语言包括乱码、空格。需要英文加特殊符号的内容
        if(preg_match("/^ [ [:alnum:] [:space:] [:punct:] [^\f\n\r\t\v]]+ $/x",$str)){
            return $str;
        }else{
            echo "含非匹配项";
        }
}
$s1 = "!!!!!!!";
$s2 = "1 1 1 1 1 1 1";
$s3 = "123asd";
echo checkString($s1)."<br>";
echo checkString($s2)."<br>";
echo checkString($s3)."<br>";

/*输出
含非匹配项
含非匹配项
含非匹配项
*/

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还有,将[]改成(),再加个第三参数$res,没有获取到结果集。如:
PHP code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->
if(preg_match("/^( [ [:alnum:] [:space:] [:punct:]]+ )$/x","11111111",$res)){
            print_r($res); 
        }else{  
   echo "含非匹配项";  //输出在这里
}

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------解决方案--------------------
[^\f\n\r\t\v] \S ,是否真的等同?
不等同!
\S 表示非空白字符,空格也是空白字符,[^\f\n\r\t\v]众位包括

------解决方案--------------------
什么意思?去除其它只保留英文字符?
------解决方案--------------------
PHP code
if(preg_match("/^( [^\s]+ )/x","1 1 1 11111",$res)){
            print_r($res);
        }else{
   echo "含非匹配项"; 
}
<br><font color="#e78608">------解决方案--------------------</font><br>你按space键位的那个空格你都没包含进来,恰巧你的串里的空格是space那个,有点晕了吧,呵呵。<br>ascii码<br>--------------<br>space -> 32<br>\n -> 10<br>\t -> 9<br>\f -> 12<br>\r -> 13<br>\v -> 11<br><br>
<br><font color="#e78608">------解决方案--------------------</font><br>你加x修正符然后正则里还有空格符,这不是白用x了么?<br>
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PHP code
if(preg_match("/([^ \f\n\r\t\v]+)/","1 2 3 4444",$res))
{
   print_r($res)
}
<br><font color="#e78608">------解决方案--------------------</font><br>第一个问题就说你想留下什么吧<br>第二个:
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PHP code
if(preg_match('/(.)\1\1/',$str,$matches))
    echo '不能有连续三位相同';
<br><font color="#e78608">------解决方案--------------------</font><br>
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探讨

PHP code

if(preg_match("/([^ \f\n\r\t\v]+)/","1 2 3 4444",$res))
{
print_r($res);
}
//输出
Array ( [0] => 1 [1] => 1 ) //2 3 4444呢?


还用,请帮忙回答:
1、可过滤换页符、换行符、回车符、空格、制表符、垂直制表符、特殊字符,正则表达式:?
2、如果在1……

------解决方案--------------------
嗯,然后加上判断是否有重复字符的,可能必须得循环了,一句正则就出来你要的结果我暂时没想到有什么方法。
------解决方案--------------------
PHP code
$s = "1 2 3 4444";

//过滤空格的正则
echo preg_replace('/\s+/', '', $s);//1234444

//过滤重复字符的正则
echo preg_replace('/(.)\\1+/', '$1', $s);//1 2 3 4

//和在一起
echo preg_replace(array('/(\s+)/', '/(.)\\1+/'), array('', '$1'), $s);//1234
<br><font color="#e78608">------解决方案--------------------</font><br>preg_match_all("/([\s*@#_)-])|((.)\\3+)/", $psw, $r);<br>print_r($r);<br><br><br>Array<br>(<br>   [0] => Array<br>       (<br>           [0] => <br>           [1] => <br>           [2] => <br>           [3] => <br>           [4] => 11<br>           [5] => 	<br>           [6] => 11<br>           [7] => <br>           [8] => 11<br>           [9] => <br>           [10] => * <div class="clear">
                 
              
              
        
            </div>
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