I'm creating a convenience macro. Part of the convenience is that a regular expression can be specified with just a String, rather than the #"re" notation.
我正在创建一个方便的宏。方便的一部分是只能用String指定正则表达式，而不是＃“re”表示法。
The one part I can't figure out is how to get the macro to take the String and rewrite it as a Clojure regex (e.g., produce the #"re" notation). I think it's a syntax / escaping problem.
我无法弄清楚的一个部分是如何让宏取出String并将其重写为Clojure正则表达式（例如，产生＃“re”表示法）。我认为这是一个语法/逃避问题。
My first naive attempt (pretending I only want the String-to-regex part):
我的第一次天真尝试（假装我只想要String-to-regex部分）：
(defmacro mymac [mystr] `#~mystr)
Is it even possible to do what I'm trying to do? Or, is there an actual function to take a String and produce a regex, instead of using the # reader macro?
甚至可以做我想做的事情吗？或者，是否有一个实际的函数来获取String并生成一个正则表达式，而不是使用#reader宏？
Or should I just drop into Java and use java.util.regex.Pattern?
或者我应该放入Java并使用java.util.regex.Pattern？
4 个解决方案
#2
7
To explain a bit more:
再解释一下：
#"" is a reader macro. It is resolved at read time by the reader. So there is no way to create a macro which expands into a reader macro, because the read phase is long gone. A macro returns the actual data structure representing the expanded code, not a string which is parsed again like eg. #define works in C.
＃“”是一个读者宏。它在阅读时由读者解决。因此，没有办法创建一个扩展为读取器宏的宏，因为读取阶段早已不复存在。宏返回表示扩展代码的实际数据结构，而不是像例如那样再次解析的字符串。 #define在C中有效。
j-g-faustus' answer is the Right Way(tm) to go.
j-g-faustus的回答是正确的方法（tm）。
#3
0
I may be misunderstanding the question, but doesn't this do what you want?
我可能误解了这个问题，但这不是你想做的吗？
user=> (. java.util.regex.Pattern compile "mystr")
#"mystr"
#4
0
To match a string verbatim, ignoring special characters:
要逐字匹配字符串，请忽略特殊字符：
(defn to-regex [some-string]
(re-pattern (java.util.regex.Pattern/quote some-string)))
Then ... will only match ..., not aaa or any other three letter combination.
然后......只会匹配......，而不是aaa或任何其他三个字母的组合。
#1
#2
7
To explain a bit more:
再解释一下：
#"" is a reader macro. It is resolved at read time by the reader. So there is no way to create a macro which expands into a reader macro, because the read phase is long gone. A macro returns the actual data structure representing the expanded code, not a string which is parsed again like eg. #define works in C.
＃“”是一个读者宏。它在阅读时由读者解决。因此，没有办法创建一个扩展为读取器宏的宏，因为读取阶段早已不复存在。宏返回表示扩展代码的实际数据结构，而不是像例如那样再次解析的字符串。 #define在C中有效。
j-g-faustus' answer is the Right Way(tm) to go.
j-g-faustus的回答是正确的方法（tm）。
#3
0
I may be misunderstanding the question, but doesn't this do what you want?
我可能误解了这个问题，但这不是你想做的吗？
user=> (. java.util.regex.Pattern compile "mystr")
#"mystr"
#4
0
To match a string verbatim, ignoring special characters:
要逐字匹配字符串，请忽略特殊字符：
(defn to-regex [some-string]
(re-pattern (java.util.regex.Pattern/quote some-string)))
Then ... will only match ..., not aaa or any other three letter combination.
然后......只会匹配......，而不是aaa或任何其他三个字母的组合。