“keys %+"是什么意思?在 perl 中? [英] What is the meaning of the "keys %+" in perl?

问题描述

简短问题:

keys %+

在 perl 中?

我在一些源代码中看到了它.

I saw it in some source code.

推荐答案

散列 %+ 具有当前范围内正则表达式中命名捕获组的所有匹配项.它在 perlvar 下的 %LAST_PAREN_MATCH 中有解释，并在 5.10 中添加.

The hash %+ has all the matches from named capture groups in regexes in the current scope. It's explained in perlvar under %LAST_PAREN_MATCH and was added in 5.10.

类似于@+，%+ 哈希允许访问命名捕获缓冲区，如果它们存在，在最后一次成功的匹配中当前活动的动态范围.[..]

Similar to @+ , the %+ hash allows access to the named capture buffers, should they exist, in the last successful match in the currently active dynamic scope. [..]

keys 函数列出了哈希.

The keys function lists all the keys in the hash.

这篇关于“keys %+"是什么意思?在 perl 中?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！