m 和 rx 之间有什么区别吗？

Question

他们似乎是used interchangeably in the documentation。有什么不同吗，即使是在意图上？

Answer 1

正如您 link 所述的文档，

m/abc/;         # a regex that is immediately matched against $_
rx/abc/;        # a Regex object
/abc/;          # a Regex object

[...] Example of difference between m/ / and / / operators:

my $match;
$_ = "abc";
$match = m/.+/; say $match; say $match.^name; # OUTPUT: «｢abc｣␤Match␤» 
$match =  /.+/; say $match; say $match.^name; # OUTPUT: «/.+/␤Regex␤»

所以 /.../ returns 一个 Regex 对象，可以作为值传递，并用于稍后和多次匹配，并且 m/.../ returns 立即执行匹配的 Match 对象。当你打印一个 Match 对象时，你会得到匹配的结果，而当你打印一个 Regex 对象时，你会得到正则表达式的文本表示。在 Perl 6 中使用 m/.../ 允许您访问隐式 Match 对象，$/:

Match results are stored in the $/ variable and are also returned from the match. The result is of type Match if the match was successful; otherwise it is Nil.

这种区别与 Python 的 re.compile vs. re.match/re.search, and a similar distinction exists in Perl 5 where you can store and re-use a regex with qr/.../ vs. m/.../ and /.../ for direct matching. As @raiph points out, not all occurrences of m/.../ and /.../ result in direct matching. Conversely, Perl 5 precompiles literal (static) regexes 相当，即使没有明确要求。（据推测，Perl 6 也执行此优化。）

m 和 rx 之间有什么区别吗？

Any difference between m and rx?

regex

syntax

raku