PHP 正则表达式 - 删除之后的字符

发布于 2024-12-21 10:47:21 字数 375 浏览 0 评论 0原文

我有类似的 PHP 字符串

$str1 = "hello ... this is the rest of the line"

，或者

$str1 = "ASDFDF ... this is also the rest of the line";

我正在尝试纠正一个正则表达式语句，该语句将在字符串中出现“...”后提取文本。我无法可靠地做到这一点......

所以在上述情况下，我想......

 $extract = "这是该行的其余部分";

...你明白了。

原文

I have PHP strings like

$str1 = "hello ... this is the rest of the line"

$str1 = "ASDFDF ... this is also the rest of the line";

I am trying to right a regex statement that will extract the text after "..." appears in the string. I am not able to do this reliably..

so in the above cases, i want to...

 $extract = "this is the rest of the line";

... you get the point.

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柏拉图鍀咏恒 2024-12-28 10:47:21

为什么使用正则表达式？只需分解字符串并选取结果中的第二个元素：

$str = "hello ... this is the rest of the line";
list(, $rest) = explode(" ... ", $str, 2) + array(, '');

这基本上是相同的事情，并且正则表达式并不更快。

Why use regex? Just explode the string and pick up the second element in the result:

$str = "hello ... this is the rest of the line";
list(, $rest) = explode(" ... ", $str, 2) + array(, '');

It's basically the same thing, and the regex for this is no faster.

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﹏半生如梦愿梦如真 2024-12-28 10:47:21

有多种方法可以做到这一点。

使用 strpos 和 substr：

function rest_of_line($line){
  $loc = strpos($line, '...');
  if($loc !== FALSE){
      return substr($line, $loc+3);
  }
  return $line;
}

$str1 = "hello ... this is the rest of the line";
$str2 = "ASDFDF ... this is also the rest of the line";
echo rest_of_line($str1);
echo rest_of_line($str2);

或使用explode：

$rest = explode('...', $str1, 2); // the 2 ensures that only the first occurrence of ... actually matters.
echo $rest[1]; // you should probably check whether there actually was a match or not

There are multiple ways to do it.

Using strpos and substr:

function rest_of_line($line){
  $loc = strpos($line, '...');
  if($loc !== FALSE){
      return substr($line, $loc+3);
  }
  return $line;
}

$str1 = "hello ... this is the rest of the line";
$str2 = "ASDFDF ... this is also the rest of the line";
echo rest_of_line($str1);
echo rest_of_line($str2);

Or using explode:

$rest = explode('...', $str1, 2); // the 2 ensures that only the first occurrence of ... actually matters.
echo $rest[1]; // you should probably check whether there actually was a match or not

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