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"
include, like inList.include? ()? e.g. to check if any of the array elements ends with _rabbit. Cheers!!
#include? But with yes #grep you can do. See my update.I'd use some small patterns:
in_list = ["edge_rabbit", "nsp_edge_rabbit", "services", "syslog", "master_rabbit", "mongod"]
in_list.select{ |s| s[/(?:^mongo)|(?:_rabbit$)/] }.join(', ') # => "edge_rabbit, nsp_edge_rabbit, master_rabbit, mongod"
Or:
in_list.grep(/(?:^mongo)|(?:_rabbit$)/).join(', ') # => "edge_rabbit, nsp_edge_rabbit, master_rabbit, mongod"
If it's possible to have variations on mongo with other trailing characters besides c, d or s, then use:
in_list.grep(/(?:^mongo[cds])|(?:_rabbit$)/).join(', ') # => "edge_rabbit, nsp_edge_rabbit, master_rabbit, mongod"
