search
HomeBackend DevelopmentPHP Tutorial 正则纠结中…该如何处理

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
<!--

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

-->
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
*/


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
}



------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>
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:
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>
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>
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How to make PHP applications fasterHow to make PHP applications fasterMay 12, 2025 am 12:12 AM

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

PHP Performance Optimization Checklist: Improve Speed NowPHP Performance Optimization Checklist: Improve Speed NowMay 12, 2025 am 12:07 AM

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

PHP Dependency Injection: Improve Code TestabilityPHP Dependency Injection: Improve Code TestabilityMay 12, 2025 am 12:03 AM

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

PHP Performance Optimization: Database Query OptimizationPHP Performance Optimization: Database Query OptimizationMay 12, 2025 am 12:02 AM

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi

Simple Guide: Sending Email with PHP ScriptSimple Guide: Sending Email with PHP ScriptMay 12, 2025 am 12:02 AM

PHPisusedforsendingemailsduetoitsbuilt-inmail()functionandsupportivelibrarieslikePHPMailerandSwiftMailer.1)Usethemail()functionforbasicemails,butithaslimitations.2)EmployPHPMailerforadvancedfeatureslikeHTMLemailsandattachments.3)Improvedeliverability

PHP Performance: Identifying and Fixing BottlenecksPHP Performance: Identifying and Fixing BottlenecksMay 11, 2025 am 12:13 AM

PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

Dependency Injection for PHP: a quick summaryDependency Injection for PHP: a quick summaryMay 11, 2025 am 12:09 AM

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

Increase PHP Performance: Caching Strategies & TechniquesIncrease PHP Performance: Caching Strategies & TechniquesMay 11, 2025 am 12:08 AM

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)