blocks|key|4577853|text|“不允许字符列表”的Regexp不是必需的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4577854|你可以看看strpbrk。它应该能做你需要的工作。|offset|length|style|CODE|4577855|下面是一个用法示例|4577856|$tests+=+array(
++++"Hello+I+should+be+allowed",
++++"Aw!+I'm+not+allowed",
++++"Geez+[another]+one",
++++"=)",
++++"<WH4T4NXSS474K>"
);
$illegal+=+"#$%25%5E&*()%2B=-[]';,./{}%7C:<>?~";

foreach+($tests+as+$test)+{
++++echo+$test;
++++echo+'+=>+';
++++echo+(false+===+strpbrk($test,+$illegal))+?+'Allowed'+:+"Disallowed";
++++echo+PHP_EOL;
}|code-block|syntax|javascript|4577857|http://codepad.org/yaJJsOpT|4577858|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/strpbrk|1^0|0|5|7|5|7|0|0|0|0|0|R|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@$D|11|E|12|F|G]]|9|@$D|13|E|14|1|15]]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|P]]]]

Regexp for a "list of disallowed character" is not mandatory.

You may have a look at <a href="http://php.net/strpbrk" rel="noreferrer"><code>strpbrk</code></a>. It should do the job you need.

Here's an example of usage

<pre><code>$tests = array(
 "Hello I should be allowed",
 "Aw! I'm not allowed",
 "Geez [another] one",
 "=)",
 "&lt;WH4T4NXSS474K&gt;"
);
$illegal = "#$%^&amp;*()+=-[]';,./{}|:&lt;&gt;?~";

foreach ($tests as $test) {
 echo $test;
 echo ' =&gt; ';
 echo (false === strpbrk($test, $illegal)) ? 'Allowed' : "Disallowed";
 echo PHP_EOL;
}
</code></pre>

<a href="http://codepad.org/yaJJsOpT" rel="noreferrer">http://codepad.org/yaJJsOpT</a>

blocks|key|745925|text|$pattern+=+preg_quote('#$%25%5E&*()%2B=-[]\';,./{}%7C\":<>?~',+'#');

var_dump(preg_match("#[{$pattern}]#",+'hello+world'));+//+false
var_dump(preg_match("#[{$pattern}]#",+'he%7C%7Co+wor%7Cd'));+//+true
var_dump(preg_match("#[{$pattern}]#",+'$uper+duper'));+//+true|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|745926|您可能可以缓存$pattern，这取决于您的实现。|unstyled|offset|length|style|CODE|745927|(尽管在正则表达式之外，您最好使用这里提到的+)|745928|entityMap^0|0|7|8|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|P|8|@$G|Q|H|R|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|F|7|T|8|@]|9|@]|A|$]]]|N|$]]

<pre><code>$pattern = preg_quote('#$%^&amp;*()+=-[]\';,./{}|\":&lt;&gt;?~', '#');

var_dump(preg_match("#[{$pattern}]#", 'hello world')); // false
var_dump(preg_match("#[{$pattern}]#", 'he||o wor|d')); // true
var_dump(preg_match("#[{$pattern}]#", '$uper duper')); // true
</code></pre>

Likely, you can cache the <code>$pattern</code>, depending on your implementation.

(Though looking outside of regular expressions, you're best of with <a href="http://php.net/strpbrk" rel="nofollow"><code>strpbrk</code></a> as mentioned here too)

blocks|key|4577876|text|return+preg_match('/[#$%25%5E&*()%2B=\-\[\]\';,.\/{}%7C":<>?~\\\\]/',+$string);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4577877|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>return preg_match('/[#$%^&amp;*()+=\-\[\]\';,.\/{}|":&lt;&gt;?~\\\\]/', $string);
</code></pre>

blocks|key|138064|text|我认为您要查找的内容可以通过包含您想要允许的字符来大大简化，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|138065|preg_match('/[%5E\w!@£]/',+$string)|code-block|syntax|javascript|138066|以下是正在发生的事情的快速分析：|138067|138068|%5E+=+not+included|unordered-list-item|138069|\w+=字母和数字|138070|！@£=您还希望允许|138071|的字符列表|138072|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|L|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|L|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

I think what you're looking for can be greatly simplified by including the characters that you want to allow like so: 

<pre><code>preg_match('/[^\w!@£]/', $string)
</code></pre>

Here's a quick breakdown of what's happening:

<ul>
<li>[^] = not included</li>
<li>\w = letters and numbers</li>
<li>! @ £ = the list of characters you would also like to allow</li>
</ul>

Morning SO. I'm trying to determine whether or not a string contains a list of specific characters.

I know i should be using <a href="http://php.net/manual/en/function.preg-match.php" rel="noreferrer">preg_match</a> for this, but my regex knowledge is woeful and i have been unable to glean any information from other posts around this site. Since most of them just want to limit strings to a-z, A-Z and 0-9. But i do want some special characters to be allowed, for example: <code>! @ £</code> and others not in the below string.

Characters to be matched on: <code># $ % ^ &amp; * ( ) + = - [ ] \ ' ; , . / { } | \ " : &lt; &gt; ? ~</code>

<pre><code>private function containsIllegalChars($string)
{
 return preg_match([REGEX_STRING_HERE], $string);
}
</code></pre>

I originally wrote the matching in Javascript, which just looped through each letter in the string and then looped through every character in another string until it found a match. Looking back, i can't believe i even attempted to use such an archaic method. With the advent of json (and a rewrite of the application!), i'm switching the match to php, to return an error message via json.

I was hoping a regex guru could assist with converting the above string to a regex string, but any feedback would be appreciated!

PHP - Regex for a string of special characters

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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早上好。我正在尝试确定一个字符串是否包含特定字符的列表。我知道我应该使用，但我的正则表达式知识很差，而且我无法从这个站点周围的其他帖子中收集任何信息。因为它们中的大多数只想将字符串限制为a-z、A-Z和0-9。但我确实希望允许某些特殊字符，例如：! @ £和其他不在以下字符串中的字符。要匹配的字符：# $ % ^ & ...

问PHP -特殊字符串的正则表达式
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