如何用正则表达式删除方括号及其之间的任何内容? [英] How to remove square brackets and anything between them with a regex?

问题描述

如何删除方括号和方括号之间的文本?

How can I remove text from between square brackets and the brackets themselves?

例如，我需要:

hello [quote="im sneaky"] world

成为:

hello world

这是我要使用的内容，但并没有解决问题:

Here's what I'm trying to use, but it's not doing the trick:

preg_replace("/[\[(.)\]]/", '', $str);

我刚结束:

hello quote="im sneaky" world

推荐答案

[和]是正则表达式中的特殊字符.它们用于列出比赛的字符. [a-z]匹配a和z之间的任何小写字母. [03b]匹配"0"，"3"或"b".要匹配字符[和]，必须用前面的\对其进行转义.

[ and ] are special characters in a regex. They are used to list characters of a match. [a-z] matches any lowercase letter between a and z. [03b] matches a "0", "3", or "b". To match the characters [ and ], you have to escape them with a preceding \.

您的代码当前显示为用空字符串替换[]().的任何字符"(为了清楚起见，从键入顺序进行了重新排序).

Your code currently says "replace any character of [](). with an empty string" (reordered from the order in which you typed them for clarity).

贪婪的比赛:

preg_replace('/\[.*\]/', '', $str); // Replace from one [ to the last ]

贪婪的匹配可以匹配多个[s和].该表达式将使用an example [of "sneaky"] text [with more "sneaky"] here并将其转换为an example here.

A greedy match could match multiple [s and ]s. That expression would take an example [of "sneaky"] text [with more "sneaky"] here and turn it into an example here.

Perl具有非贪婪匹配的语法(您很可能不想贪婪):

Perl has a syntax for a non-greedy match (you most likely don't want to be greedy):

preg_replace('/\[.*?\]/', '', $str);

非贪婪匹配尝试捕获尽可能少的字符.使用相同的示例:an example [of "sneaky"] text [with more "sneaky"] here变为an example text here.

Non-greedy matches try to catch as few characters as possible. Using the same example: an example [of "sneaky"] text [with more "sneaky"] here becomes an example text here.

仅以下第一个]:

preg_replace('/\[[^\]]*\]/', '', $str); // Find a [, look for non-] characters, and then a ]

这是更明确的，但更难阅读.使用相同的示例文本，您将获得非贪婪表达式的输出.

This is more explicit, but harder to read. Using the same example text, you'd get the output of the non-greedy expression.

请注意，这些都没有明确处理空白. [和]两侧的空格都将保留.

Note that none of these deal explicitly with white space. The spaces on either side of [ and ] will remain.

还要注意，所有这些都可能因格式错误而失败.多个[和]不匹配可能会导致令人惊讶的结果.

Also note that all of these can fail for malformed input. Multiple [s and ]s without matches could cause a surprising result.

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