Generating a string with elements from an array based on pattern matching

最新推荐文章于 2022-06-27 00:29:58 发布

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本文介绍了一种使用Ruby语言从数组中筛选特定格式字符串的方法，并将其组合成逗号分隔的字符串。通过使用`end_with?`和`grep`等方法，可以轻松地提取以特定字符结尾或符合正则表达式的元素。

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I have an array like this:

inList = ["edge_rabbit", "nsp_edge_rabbit", "services", "syslog", "master_rabbit", "mongod", ...]

How can I take the elements that end with _rabbit or elements with the format mongo[cds], and generate a comma separated string like the following?

"edge_rabbit, nsp_edge_rabbit, master_rabbit"

Is this the one you are looking for using String#end_with? and Array#select?
inList = ["edge_rabbit", "nsp_edge_rabbit", "services", "syslog", "master_rabbit", "mongod"]
inList.select{|e| e.end_with?('_rabbit')}.join(", ")
# => "edge_rabbit, nsp_edge_rabbit, master_rabbit"
or
inList = ["edge_rabbit", "nsp_edge_rabbit", "services", "syslog", "master_rabbit", "mongod"]
inList.grep(/_rabbit$/).join(", ")
# => "edge_rabbit, nsp_edge_rabbit, master_rabbit"


inList = ["edge_rabbit","_rabbit_ut", "nsp_edge_rabbit", "services", "syslog", "master_rabbit", "mongod","mongos","mongoy"]
inList.grep(/_rabbit$|^mongo[cds]/).join(", ")
# => "edge_rabbit, nsp_edge_rabbit, master_rabbit, mongod, mongos"