我正在看RWH教程here，该教程建议使用static List getMetals() {
grails.util.Holders.config.metals
}
返回多个结果，但有一个错误。如您所见：
[String]生产
"I'd like to group by word breaks" =~ "\\S+" :: Bool
"I'd like to group by word breaks" =~ "\\S+" :: String
"I'd like to group by word breaks" =~ "\\S+" :: [[String]]
分别。
但是推荐的True
"I'd"
[["I'd"],["like"],["to"],["group"],["by"],["word"],["breaks"]]
却没有，而是出现错误：
[String]我该如何请求缺少的"I'd like to group by word breaks" =~ "\\S+" :: [String]
<interactive>:1:1: error:
• No instance for (RegexContext Regex String [String]) arising from a use of ‘=~’
• In the expression: "I'd like to group by word breaks" =~ "\\S+" :: [String]
In an equation for ‘it’: it = "I'd like to group by word breaks" =~ "\\S+" :: [String]
型建议，该建议将提供我想要的东西，即：
[String]无需后处理？同样，有趣的是，在其他成功的类型转换的背景下，这似乎很自然，甚至在本书写作时的某个时候也是如此，并且不再适用。更改的解释是什么？
答案 0 :(得分：1)
从评论中看来，建议是：
Prelude Text.Regex.PCRE> getAllTextMatches ("I'd like to group by word breaks" =~ "\\S+") :: [String]
["I'd","like","to","group","by","word","breaks"]
或
Prelude Text.Regex.PCRE> concat $ "I'd like to group by word breaks" =~ "\\S+" :: [String]
["I'd","like","to","group","by","word","breaks"]
这些都不像以前那样干净。