Hi I am working on RoR project with ruby-2.5.0 and Rails 5. I have a pattern to find time from a string as follows:-
嗨我正在使用ruby-2.5.0和Rails 5处理RoR项目。我有一个模式可以从字符串中查找时间如下： -
time_pattern = /(\d{2}\:\d{2}:\d{2}|\d{2}\:\d{2})/
time = mystr[time_pattern]
It retuns the first matching time in the string for example if there are two times are present in the string "14:04" and "14:05" it will always return the first one which is "14:04". i need to find the second one. Please help me to find the second match using regex. I have also tried the scan method like:-
它返回字符串中的第一个匹配时间，例如，如果字符串“14:04”和“14:05”中存在两次，则它将始终返回第一个“14:04”。我需要找到第二个。请帮我找到使用正则表达式的第二场比赛。我也尝试了扫描方法，如： -
time = params.to_s.scan(time_pattern).uniq.flatten.last
But my rubocop throws an error Methods exceeded maximum allowed ABC complexity (1) Please help. Thanks in advance.
但我的rubocop抛出一个错误方法超出了最大允许的ABC复杂度（1）请帮助。提前致谢。
2 个解决方案
#1
1
Try using the following expression: /(\d{2}:\d{2}(:\d{2})?)/g.
尝试使用以下表达式：/（\ d {2}：\ d {2}（：\ d {2}）？）/ g。
Here is an example of it running in ruby:
以下是在ruby中运行的示例：
re = /(\d{2}:\d{2}(:\d{2})?)/
str = ' "14:04" and "14:05"'
# Get matches
matches = str.scan(re)
# Get last match
matches = str.scan(re)
# Get last match
lastMatch = str.scan(re).last[0]
# Print last match
puts lastMatch.to_s
# OUTPUT => "14:05"
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
#2
0
Last Regex Match
To get the last match you can simply call #last on the #scan result.
要获得最后一个匹配，您只需在#scan结果上调用#last即可。
regex = /(\d{2}\:\d{2}:\d{2}|\d{2}\:\d{2})/ # original
# or
regex = /\d{2}(?::\d{2}){1,2}/ # kudos @ctwheels
string = '12:01, 12:02, 12:03:04, 12:05'
string.scan(regex).last
#=> "12:05"
ABC-Metric
The ABC Metric is more complex and would require having a look at your whole method. But here is a blog post that explains it pretty well: Understanding Assignment Branch Condition
ABC Metric更复杂，需要查看整个方法。但是这篇博文很好地解释了它：理解作业分支条件
Another options is to change the max ABC size in the RuboCop settings. Have a look at the RuboCop Configuration Documentation and the default configuration (Metrics/AbcSize max size is set to 15 by default).
另一个选项是更改RuboCop设置中的最大ABC大小。查看RuboCop配置文档和默认配置（Metrics / AbcSize max size默认设置为15）。
#1
1
Try using the following expression: /(\d{2}:\d{2}(:\d{2})?)/g.
尝试使用以下表达式：/（\ d {2}：\ d {2}（：\ d {2}）？）/ g。
Here is an example of it running in ruby:
以下是在ruby中运行的示例：
re = /(\d{2}:\d{2}(:\d{2})?)/
str = ' "14:04" and "14:05"'
# Get matches
matches = str.scan(re)
# Get last match
matches = str.scan(re)
# Get last match
lastMatch = str.scan(re).last[0]
# Print last match
puts lastMatch.to_s
# OUTPUT => "14:05"
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
#2
0
Last Regex Match
To get the last match you can simply call #last on the #scan result.
要获得最后一个匹配，您只需在#scan结果上调用#last即可。
regex = /(\d{2}\:\d{2}:\d{2}|\d{2}\:\d{2})/ # original
# or
regex = /\d{2}(?::\d{2}){1,2}/ # kudos @ctwheels
string = '12:01, 12:02, 12:03:04, 12:05'
string.scan(regex).last
#=> "12:05"
ABC-Metric
The ABC Metric is more complex and would require having a look at your whole method. But here is a blog post that explains it pretty well: Understanding Assignment Branch Condition
ABC Metric更复杂，需要查看整个方法。但是这篇博文很好地解释了它：理解作业分支条件
Another options is to change the max ABC size in the RuboCop settings. Have a look at the RuboCop Configuration Documentation and the default configuration (Metrics/AbcSize max size is set to 15 by default).
另一个选项是更改RuboCop设置中的最大ABC大小。查看RuboCop配置文档和默认配置（Metrics / AbcSize max size默认设置为15）。