检测textarea提交中的特定单词 [英] Detecting specific words in a textarea submission

问题描述

我的网站上有一项新功能，用户可以通过textarea提交任何文本（我停止了所有HTML条目）。我仍然有一个主要问题，那就是他们可以输入http://somewhere.com，这是我想要阻止的事情。我也想黑名单特定的单词。这是我以前的样子：

  if（strpos（$ entry，http：//或.comor .net或www。或.org或.co.uk或https：//）！== true）{
 die（'条目不能包含链接！'）; 
  

然而，这并不奏效，因为它阻止了用户提交任何文本。所以我的问题很简单，我该怎么做呢？

/www.google.co.uk/search?q=regular+expressionsrel =nofollow>正则表达式。

您需要做什么它是这样的：

  //你不允许的单词列表
 $ disallowedWords = array（
'这些'，
'字'，
'是'，
'不'，
'允许'
）; 
 //搜索不允许的单词。 
 //这里使用的正则表达式应该例如匹配'是'，但不匹配'care'或'stare'
 foreach（$ disallowedWords as $ word）{
 if（preg_match（/ \ s + $ word \s + / i， $ entry））{
 die（单词'$ word'不允许...）; 
} 
} 
 
 //这个变量应该包含一个匹配URL的正则表达式
 //这里有成千上万的数字，请选择。我只有
 //使用了我在Google 
 $ urlRegex ='（http | https | ftp）\中找到的任意一个：//（[a-zA-Z0-9\.\\ \\  - ] +（。\：[A-ZA-Z0-9\&放大器;放大器;％\ $ \  - ] +）* @）*（（25 [0-5] | 2  -  [O- 4] [0-9] | [0-1] {1} [0-9] {2} | [1-9] {1} [0-9] {1} | [1-9]）\ （25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1-9] {1} [0-9 ] {1} | [1-9] | 0）\（25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] { 2} | [1-9] {1} [0-9] {1} | [1-9] | 0）\（25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1-9] {1} [0-9] {1} | [0-9]）|本地主机|（[A-ZA- Z0-9\  - ] + \）* [A-ZA-Z0-9\  - ] + \（COM |。EDU |政府网站|国际|万|网络|组织| BIZ | ARPA |资讯|名称|亲|航空|鸡舍|博物馆| [A-ZA-Z] {2}））（\：[0-9] +）*（/（$ | [A-ZA-Z0-9\。 \？，\ \'\\\ +&放大器;放大器;％\ $＃\ =〜_\  - ] +））*'; 
 
 //搜索URL 
 if（preg_match（$ urlRegex，$ entry））{
 die（URLs not allowed ...）; 
} 
  

I have a new feature on my site, where users can submit any text (I stopped all HTML entries) via a textarea. The main problem I still have though is that they could type "http://somewhere.com" which is something I want to stop. I also want to blacklist specific words. This is what I had before:

if (strpos($entry, "http://" or ".com" or ".net" or "www." or ".org" or ".co.uk" or "https://") !== true) {
            die ('Entries cannot contain links!');

However that didn't work, as it stopped users from submitting any text at all. So my question is simple, how can I do it?

解决方案

This is a job for Regular Expressions.

What you need to do it something like this:

// A list of words you don't allow
$disallowedWords = array(
  'these',
  'words',
  'are',
  'not',
  'allowed'
);
// Search for disallowed words.
// The Regex used here should e.g. match 'are', but not match 'care' or 'stare'
foreach ($disallowedWords as $word) {
  if (preg_match("/\s+$word\s+/i", $entry)) {
    die("The word '$word' is not allowed...");
  }
}

// This variable should contain a regex that will match URLs
// there are thousands out there, take your pick. I have just
// used an arbitrary one I found with Google
$urlRegex = '(http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\?\'\\\+&%\$#\=~_\-]+))*';

// Search for URLs
if (preg_match($urlRegex, $entry)) {
  die("URLs are not allowed...");
}

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