Ruby String#scan等效于返回MatchData [英] Ruby String#scan equivalent to return MatchData

问题描述

如问题标题中所述，在Ruby字符串上是否有一种等效于 String#Scan ，而不是仅返回每个匹配项的列表，而是返回一个MatchData s数组?例如:

As basically stated in the question title, is there a method on Ruby strings that is the equivalent to String#Scan but instead of returning just a list of each match, it would return an array of MatchDatas? For example:

# Matches a set of characters between underscore pairs
"foo _bar_ _baz_ hashbang".some_method(/_[^_]+_/) #=> [#&ltMatchData "_bar_"&rt, &ltMatchData "_baz_"&rt]

或者我能获得相同或相似结果的任何方式都会很好.我想这样做是为了找到Ruby字符串中字符串"的位置和范围，例如"goodbye和"world"位于'再见'残酷的'世界'"中.

Or any way I could get the same or similar result would be good. I would like to do this to find the positions and extents of "strings" within Ruby strings, e.g. "goodbye and "world" inside "'goodbye' cruel 'world'".

推荐答案

您可以通过利用pos参数rel ="nofollow noreferrer"> String#match .像这样:

You could easily build your own by exploiting MatchData#end and the pos parameter of String#match. Something like this:

def matches(s, re)
  start_at = 0
  matches  = [ ]
  while(m = s.match(re, start_at))
    matches.push(m)
    start_at = m.end(0)
  end
  matches
end

然后:

>> matches("foo _bar_ _baz_ hashbang", /_[^_]+_/)
=> [#<MatchData "_bar_">, #<MatchData "_baz_">]
>> matches("_a_b_c_", /_[^_]+_/)
=> [#<MatchData "_a_">, #<MatchData "_c_">]
>> matches("_a_b_c_", /_([^_]+)_/)
=> [#<MatchData "_a_" 1:"a">, #<MatchData "_c_" 1:"c">]
>> matches("pancakes", /_[^_]+_/)
=> []

如果您确实愿意，可以将其修补到String中.

You could monkey patch that into String if you really wanted to.

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