使用正则表达式提取括号中的内容

发布于 2024-10-26 22:23:54 字数 212 浏览 4 评论 0原文

我真的完全不懂正则表达式，这让我很头疼。

我有一些看起来像这样的文本

blah blah blah (here is the bit I'd like to extract)

...我不太明白如何使用 PHP 的 preg_split 或等效命令来提取它。

我该怎么做？哪里是了解 preg 工作原理的好地方？

原文

I really don't understand regex at all, and it hurts my head.

I've a bit of text which looks like this

blah blah blah (here is the bit I'd like to extract)

...and I don't really understand how to extract this using PHP's preg_split, or equivalent, command.

How do I do this? And where's a good place to understand how preg works?

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对你的占有欲 2024-11-02 22:23:54

像这样的东西应该可以解决问题，以匹配 ( 和 ) 之间的内容：

$str = "blah blah blah (here is the bit I'd like to extract)";
if (preg_match('/\(([^\)]+)\)/', $str, $matches)) {
    var_dump($matches[1]);
}

你会得到：

string 'here is the bit I'd like to extract' (length=35)

基本上，我使用的模式搜索：

一个开头 ( ；但是 as ( 具有特殊含义，必须转义： \(
一个或多个不是的字符右括号：[^\)]+
- 这已被捕获，因此我们稍后可以使用它：([^\)]+)
- 第一个（并且仅在此处）捕获的内容将作为 $matches[1]
结束 ) ；在这里，它也是一个必须转义的特殊字符：\)

Something like this should do the trick, to match what is between ( and ) :

$str = "blah blah blah (here is the bit I'd like to extract)";
if (preg_match('/\(([^\)]+)\)/', $str, $matches)) {
    var_dump($matches[1]);
}

And you'd get :

string 'here is the bit I'd like to extract' (length=35)

Basically, the pattern I used searches for :

An opening ( ; but as ( has a special meaning, it has to be escaped : \(
One or more characters that are not a closing parenthesis : [^\)]+
- This being captured, so we can use it later : ([^\)]+)
- And this first (and only, here) captured thing will be available as $matches[1]
A closing ) ; here, too, it's a special character that has to be escaped : \)

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没︽人懂的悲伤 2024-11-02 22:23:54

<?php

$text = "blah blah blah (here is the bit I'd like to extract)";
$matches = array();
if(preg_match('!\(([^)]+)!', $text, $matches))
{
    echo "Text in brackets is: " . $matches[1] . "\n";
}

<?php

$text = "blah blah blah (here is the bit I'd like to extract)";
$matches = array();
if(preg_match('!\(([^)]+)!', $text, $matches))
{
    echo "Text in brackets is: " . $matches[1] . "\n";
}

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