Question

我想知道是否可以使用正则表达式截断数组。

特别是我有一个像这样的数组：

$array = array("AaBa","AaBb","AaBc","AaCa","AaCb","AaCc","AaDa"...);

我有这个字符串：

$str = "AC";

我想从匹配$array的字符串的开头到最后一次出现的/A.C./切片（在样本中，索引为5的“AaCc”）：

$result = array("AaBa","AaBb","AaBc","AaCa","AaCb","AaCc");

我该怎么做？我以为我可能会使用array_slice，但我不知道如何使用RegEx。

Answer 1

这是my bid

function split_by_contents($ary, $pattern){
  if (!is_array($ary)) return FALSE; // brief error checking

  // keep track of the last position we had a match, and the current
  // position we're searching
  $last = -1; $c = 0;

  // iterate over the array
  foreach ($ary as $k => $v){
    // check for a pattern match
    if (preg_match($pattern, $v)){
      // we found a match, record it
      $last = $c;
    }
    // increment place holder
    $c++;
  }

  // if we found a match, return up until the last match
  // if we didn't find one, return what was passed in
  return $last != -1 ? array_slice($ary, 0, $last + 1) : $ary;
}

更新

我的原始答案有一个$limit参数没有用。我最初有一个不同的方向，我将采用解决方案，但决定保持简单。但是，下面是version that implements that $limit。所以......

function split_by_contents($ary, $pattern, $limit = 0){
  // really simple error checking
  if (!is_array($ary)) return FALSE;

  // track the location of the last match, the index of the
  // element we're on, and how many matches we have found
  $last = -1; $c = 0; $matches = 0;

  // iterate over all items (use foreach to keep key integrity)
  foreach ($ary as $k => $v){

    // text for a pattern match
    if (preg_match($pattern, $v)){

      // record the last position of a match
      $last = $c;

      // if there is a specified limit, capture up until
      // $limit number of matches, then exit the loop
      // and return what we have
      if ($limit > 0 && ++$matches == $limit){
        break;
      }
    }

    // increment position counter
    $c++;
  }

Answer 2

我认为最简单的方法可能是使用foreach循环，然后对每个值使用正则表达式 - 虽然很高兴被证明是错误的！

一种替代方案可能是先破坏阵列......

$array = array("AaBa","AaBb","AaBc","AaCa","AaCb","AaCc","AaDa"...);
$string = implode('~~',$array);
//Some regex to split the string up as you want, guessing something like
// '!~~A.C.~~!' will match just what you want?
$result = explode('~~',$string);

如果你喜欢我可以做的正则表达式的一只手，那就不是100％正是你所要求的 - "A*C*"-->"AaCc"位我不太确定吗？

Answer 3

假设从0开始的增量数字索引

$array = array("AaBa","AaBb","AaBc","AaCa","AaCb","AaCc","AaDa");
$str = "AC";

$regexpSearch = '/^'.implode('.',str_split($str)).'.$/';
$slicedArray = array_slice($array,
                           0,
                           array_pop(array_keys(array_filter($array,
                                                             function($entry) use ($regexpSearch) { 
                                                                 return preg_match($regexpSearch,$entry); 
                                                             }    
                                                            )
                                               )
                                    )+1
                          );

var_dump($slicedArray);

PHP＆gt; = 5.3.0并将提供

严格的标准：只应通过引用传递变量

如果未找到匹配项，仍会返回第一个元素。

使用正则表达式拆分数组

3 个答案:

更新