正则表达式允许 A-Z, - 和 ' [英] Regex to allow A-Z, - and '

问题描述

我试图让这个正则表达式工作来验证名称字段以只允许 A-Z、' 和 -.

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

到目前为止，我正在使用它，除了它不允许使用撇号外，它运行良好.

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

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

我希望它只允许 A-Z、-(破折号)和一个 '(撇号).它适用于 A-Z 和 - 但仍然不适用于 '

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 '

有人可以举个例子吗?

谢谢

推荐答案

您的代码已经按照您的意愿行事:

Your code already does what you want it to:

<?php

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

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

);

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

...打印:

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

单引号在正则表达式中没有任何特殊含义，因此无需特殊处理.减号(-)，在[]中，表示范围；如果您需要文字 - 它必须是第一个或最后一个字符，就像在您的代码中一样.

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

说那个，错误(如果有的话)在别的地方.

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

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