使用 Perl 正则表达式去除关闭 php 标签

发布于 2024-12-07 11:09:56 字数 397 浏览 0 评论 0原文

我有 php 文件，我想删除结束标记 (?>)，但前提是它是最后一个结束标记并且后面没有任何内容。

<?php
  //some code
?>
<?php
  //some other code
?> // <- this and only this should be removed

我尝试过模式 's/(\s*\?>\s*)$//s' 及其几个突变，但没有成功：它们删除了所有出现的 ?> ，破坏了代码，并且我不知道如何匹配EOF。

（是的，我知道一个解决方法：使用例如 tail -1 仅检查文件的最后一行，但这会使我的整个代码格式化脚本变得复杂，因此如果可以使用正确构造的正则表达式来解决问题，那就太好了。）

原文

I have php file, and I want to remove closing tag (?>), but only if it is last closing tag and there is nothing after.

<?php
  //some code
?>
<?php
  //some other code
?> // <- this and only this should be removed

I have tried pattern 's/(\s*\?>\s*)$//s' and several of its mutations, but with no success: they remove all occurrences of ?>, breaking the code, and I don't know how to match EOF.

(Yes, I know a workaround: using e.g. tail -1 to check only last line of file, but it would complicate my whole code-formatting script, so if the problem can be resolved with properly constructed regex, it would be great.)

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

只有影子陪我不离不弃 2024-12-14 11:09:56

我现在有机会测试一下。读取所有文件确实有效。这个 Perl 代码对我有用：

local $/;
open FH, "<", "tmp.php";
$var = <FH>;
print "$var\n\n";
close FH;
$var =~ s/(\s*\?>\s*)$//s;
print "$var\n";

在以下 php 代码上：

<?php
//some code
?>
<?php
//some other code
?>

I now had a chance to test it. Reading all file does work. This perl code worked for me:

local $/;
open FH, "<", "tmp.php";
$var = <FH>;
print "$var\n\n";
close FH;
$var =~ s/(\s*\?>\s*)$//s;
print "$var\n";

on the following php code:

<?php
//some code
?>
<?php
//some other code
?>

回复收藏 0 原文

兮子 2024-12-14 11:09:56

好吧，让我们来分解一下。

您想要匹配 '?>'，因此我们将从 ('?>') 开始，但由于 '?'在正则表达式中具有特殊含义，我们需要对其进行转义：('\?>')。

我们不关心结束标签之前的内容，但我们想确保它之后没有任何内容（除了空格）。你已经赚了很多钱了：我们需要 \s 和 $。我会这样做：

('\?>')\s*$

希望这对你有用。

OK, let's break this down.

You want to match '?>', so we'll start with ('?>'), but since '?' has special meaning in regex, we need to escape it: ('\?>').

We don't care about what's before the closing tag, but we want to make sure nothing (except whitespace) is after it. You were pretty much on the money with this: we need \s and $. I'd do it like this: