Question

这是一个字符串。没有任何新的线条。我需要换行段落。我决定使用跟随停止，即点后跟白色空间来制作段落中每两个点出现的段落字符串。

在上面的虚拟字符串中，正如我所描述的那样，我需要在每次出现.时将字符串拆分，后面跟一个空格来添加\n或<p>标记。

我知道的唯一方法是explode。然后在数组内循环并在每两个元素后继续。但是，它将分割字符串，无论其是否跟随空格。

此外，此过程可能存在性能问题。

我需要知道是否有办法更准确，更有效率。

$arr = explode('.',$mystring);
$output = '';
for ($i=0; $i < count($arr); $i++){
  $output .= $arr[$i].'. ';
  if (isset($arr[$i+1])){
   $output .= $arr[$i+1].'. '."\n";
   $i++;
  }
  else{
   $output .= '. '."\n";
  }
}

换句话说，上面引用的字符串应该如下所示：

This is a string. Without any new lines.
I need the newlines to make paragraphs. I decided to use follow-stop i.e the dot followed by white space to make paragraphs every two occurance of those dots in the string.

Answer 1

正则表达式方法怎么样？

$string = 'This is a string. Without any new lines. I need the newlines to make paragraphs. I decided to use follow-stop i.e the dot followed by white space to make paragraphs every two occurance of those dots in the string.';
preg_match_all('~((?:.+?\.){2})(.*)~', $string, $matches);
print_r($matches);

输出：

Array
(
    [0] => Array
        (
            [0] => This is a string. Without any new lines. I need the newlines to make paragraphs. I decided to use follow-stop i.e the dot followed by white space to make paragraphs every two occurance of those dots in the string.
        )

    [1] => Array
        (
            [0] => This is a string. Without any new lines.
        )

    [2] => Array
        (
            [0] =>  I need the newlines to make paragraphs. I decided to use follow-stop i.e the dot followed by white space to make paragraphs every two occurance of those dots in the string.
        )

)

Regex101演示：https://regex101.com/r/iV1gR1/1

0是整个发现的表达。 1是第一个被捕获的组（也就是前2个句子）。 2是剩下的内容。

实际上在重读问题时，你是否试图分裂每一句话？如果是这样，也许这就是你想要的：

$string = 'This is a string. Without any new lines. I need the newlines to make paragraphs. I decided to use follow-stop i.e the dot followed by white space to make paragraphs every two occurance of those dots in the string.';
preg_match_all('~(.+?[.?!])(?:\s+|$)~', $string, $matches);
print_r($matches[1]);

输出：

Array
(
    [0] => This is a string.
    [1] => Without any new lines.
    [2] => I need the newlines to make paragraphs.
    [3] => I decided to use follow-stop i.e the dot followed by white space to make paragraphs every two occurance of those dots in the string.
)

Answer 2

使用str_replace

{{1}}

拆分每个定义的分隔符重复的字符串

2 个答案: