用于匹配变量名称和值（数组）的正则表达式

Question

所以我遇到了这个问题。 我有一个像这样的字符串：

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我想将其与正则表达式匹配，以便我拥有变量名称：_0x2804 和变量的值。

我创建了这个正则表达式：

var ([_0-9a-zA-Z]*).?=.?\[([\"a-zA-Z0-9,\\]*)\]

这似乎在我的正则表达式测试器中工作，但是当尝试在 php 中使用它时（当然带有“/”）。 preg_match 和 preg_match_all 均因错误而失败

Answer 1

您还没有关闭第二个字符类。

问题就在这里：

\[([\"a-zA-Z0-9,\\]*)\]
                ^^^

要匹配文字 [ 你需要转义它并且你已经得到了正确的结果。您还在字符类中包含 \\ 以包含 \ 但这是不正确的。它所做的是转义下面的 ]，因此字符类没有结束。您需要的是 \\\\ 在字符类中具有 \：

\[([\"a-zA-Z0-9,\\\\]*)\]
                ^^^^

在 Ideone 上查看