blocks|key|343931|text|"/[%5Ea-zA-Z'-]%2B/"实际上匹配除a-zA-z'-之外的所有内容，如果您将%5E放入以指示字符串的开头，则应将其放在括号外。此外，表达式的'-部分可能被解释为范围，因此您应该在@Tom回答时转义-，或者在其他人回答时转义,|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|343932|entityMap^0|0|G|M|8|20|2|2S|1|35|1|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

<code>"/[^a-zA-Z'-]+/"</code> actually matches everything but <code>a-zA-z'-</code>, if you put the ^ in to indicate the start-of-string, you should put it outside the brackets.
Also, the <code>'-</code> part of your expression is possibly being interpreted as a range, so you should escape the <code>-</code> as @Tom answered or escape the <code>,</code> as someone else answered

blocks|key|3271196|text|if+(preg_match("/%5E[A-Z'-]%2B$/",$firstname))+{
++++//+do+something
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3271197|字符类[]中的插入符号%5E将取消匹配。按照您的方式，这意味着如果$firstname包含a-z、A-Z、'和-以外的字符。|unstyled|offset|length|style|CODE|3271198|entityMap^0|0|3|2|B|1|V|A|17|3|1B|3|1F|1|1H|1|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]|$G|Q|H|R|I|J]|$G|S|H|T|I|J]|$G|U|H|V|I|J]|$G|W|H|X|I|J]|$G|Y|H|Z|I|J]|$G|10|H|11|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|12|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>if (preg_match("/^[A-Z'-]+$/",$firstname)) {
 // do something
}
</code></pre>

The caret <code>^</code> inside a character class <code>[]</code> will negate the match. The way you have it, it means if the <code>$firstname</code> contains characters other than <code>a-z</code>, <code>A-Z</code>, <code>'</code>, and <code>-</code>.

blocks|key|5382481|text|您的regexp应该如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5382482|preg_match("/%5E[A-Z\'-]%2B$/",$firstname);|code-block|syntax|javascript|5382483|机器：AB+A-B+AB-'|offset|length|style|CODE|5382484|不匹配：Ab+a-B+AB#+<empty+string>|5382485|entityMap^0|0|0|3|2|6|3|A|4|0|4|2|7|3|B|3|F|E|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@$I|10|J|11|K|L]|$I|12|J|13|K|L]|$I|14|J|15|K|L]|$I|16|J|17|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|P|$]]

Your regexp should look like this:

<pre><code>preg_match("/^[A-Z\'-]+$/",$firstname);
</code></pre>

maches: <code>AB</code> <code>A-B</code> <code>AB-'</code>

does not match: <code>Ab</code> <code>a-B</code> <code>AB#</code> <code>&lt;empty string&gt;</code>

blocks|key|5382505|text|你的代码已经完成了你想要做的事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5382506|<?php

$data+=+array(
++++//+Valid
++++'Jim',
++++'John',
++++"O'Toole",
++++'one-two',
++++"Daniel'Blackmore",

++++//+Invalid
++++'+Jim',
++++'abc123',
++++'$@#$%25@#$%25&*(*&){}//;;',

);

foreach($data+as+$firstname){
++++if(+preg_match("/[%5Ea-zA-Z'-]%2B/",$firstname)+){
++++++++echo+'Invalid:+'+.+$firstname+.+PHP_EOL;
++++}else{
++++++++echo+'Valid:+'+.+$firstname+.+PHP_EOL;
++++}
}|code-block|syntax|javascript|5382507|..。打印：|5382508|Valid:+Jim
Valid:+John
Valid:+O'Toole
Valid:+one-two
Valid:+Daniel'Blackmore
Invalid:++Jim
Invalid:+abc123
Invalid:+$@#$%25@#$%25&*(*&){}//;;|5382509|单引号在正则表达式中没有任何特殊含义，因此不需要特殊处理。在[]中，减号(-)表示范围；如果需要文字-，它必须是第一个或最后一个字符，就像在代码中一样。|offset|length|style|CODE|5382510|话虽如此，错误(如果有的话)在其他地方。|5382511|entityMap^0|0|0|0|0|U|2|11|1|1E|1|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]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@$M|Z|N|10|O|P]|$M|11|N|12|O|P]|$M|13|N|14|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

Your code already does what you want it to:

<pre><code>&lt;?php

$data = array(
 // Valid
 'Jim',
 'John',
 "O'Toole",
 'one-two',
 "Daniel'Blackmore",

 // Invalid
 ' Jim',
 'abc123',
 '$@#$%@#$%&amp;*(*&amp;){}//;;',

);

foreach($data as $firstname){
 if( preg_match("/[^a-zA-Z'-]+/",$firstname) ){
 echo 'Invalid: ' . $firstname . PHP_EOL;
 }else{
 echo 'Valid: ' . $firstname . PHP_EOL;
 }
}
</code></pre>

... prints:

<pre><code>Valid: Jim
Valid: John
Valid: O'Toole
Valid: one-two
Valid: Daniel'Blackmore
Invalid: Jim
Invalid: abc123
Invalid: $@#$%@#$%&amp;*(*&amp;){}//;;
</code></pre>

The single quote does not have any special meaning in regular expressions so it needs no special treatment. The minus sign (<code>-</code>), when inside <code>[]</code>, means range; if you need a literal <code>-</code> it has to be the first or last character, as in your code.

Said that, the error (if any) is somewhere else.

blocks|key|2255608|text|据我所知。下面的正则表达式应该可以正常工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2255609|if+(preg_match("/%5E[A-Z\'\-]%2B$/",$firstname))+{
++++//+do+something
}|code-block|syntax|javascript|2255610|在这里，我避开了撇号和破折号。我已经在一个在线Regex测试器中对其进行了测试，并且运行良好。|2255611|试试看|2255612|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

From what I see. Following Regex should work fine:

<pre><code>if (preg_match("/^[A-Z\'\-]+$/",$firstname)) {
 // do something
}
</code></pre>

Here I have escaped both apostrophe and dash. I have tested this in an online Regex tester and works just fine.

Give it a try

blocks|key|343996|text|if+(preg_match("/%5E[a-zA-Z+-]*$/",+$firstname))+{
++++//+do+something+here
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|343997|我已经用过这个了，这个会工作的很好。使用它。|unstyled|343998|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>if (preg_match("/^[a-zA-Z -]*$/", $firstname)) {
 // do something here
}
</code></pre>

I have used this, This will work fine. Use It.

I am trying to get this Regex to work to validate a Name field to only allow A-Z, ' and -. 

So far I am using this which is working fine apart from it wont allow an apostrophe. 

<pre><code>if (preg_match("/[^a-zA-Z'-]+/",$firstname)) {
 // do something
 }
</code></pre>

I would like it to only allow A-Z, - (dash) and an ' (apostrophe). It works for the A-Z and the - but still wont work for the '

Could someone please provide an example?

Thanks

Regex to allow A-Z, - and '

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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我正在尝试让这个正则表达式来验证一个仅允许A - Z，‘和-的Name字段。到目前为止，我正在使用这个，除了它不允许撇号之外，它工作得很好。if (preg_match("/[^a-zA-Z'-]+/",$firstname)) {            // do something        }我希望它只允许A...

问正则表达式允许A-Z，- and‘
EN

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