当一个词只是一个词时，去掉一个词，而不是复合词的一部分

问题描述

我有以下功能，我希望它在只有一个单词时去除alpha"而不是像alphadog"这样的复合词的一部分.现在我只看到狗"，这不好.有什么帮助吗?

I have the following function, I want it to strip "alpha" when is a single word onlyand not a part of a composite word like "alphadog". Now instead I just see "dog" and it's not good. Any help?

    function stripwords($string)
{
  // build pattern once
  static $pattern = null;
  if ($pattern === null) {
    // pull words to remove from somewhere
    $words = array('alpha', 'beta', '-');
    // escape special characters
    foreach ($words as &$word) {
      $word = preg_quote($word, '#');
    }
    // combine to regex
    $pattern = '#\b(' . join('|', $words) . ')\b\s*#iS';
  }

  $print = preg_replace($pattern, '', $string);
  list($firstpart)=explode('+', $print);
  return $firstpart;

}

我有另一个问题......我已经用新版本的函数编辑了上面的内容:它删除单词，调整空格，然后做我需要的其他事情，但它不会删除破折号(或减号)……怎么了?我尝试了一些但无济于事...谢谢

edit: i have another problem... i've edited above with the new version of the function: it strips words, adjust whitespaces and then does something else i need, but it doesn't remove dashes (or minus)... what's wrong? i tried something but no avail...thanks

推荐答案

这个:

$pattern = '#' . join('|', $words) . '#iS';

应该是这样的:

$pattern = '#\b' . join('\b|\b', $words) . '\b#iS';

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