Is there a way to do this?
I have an array:
["file_1.jar", "file_2.jar","file_3.pom"]
And I want to keep only "file_3.pom", what I want to do is something like this:
array.drop_while{|f| /.pom/.match(f)}
But This way I keep everything in array but "file_3.pom" is there a way to do something like "not_match"?
I found these:
f !~ /.pom/ # => leaves all elements in array
OR
f !~ /*.pom/ # => leaves all elements in array
But none of those returns what I expect.
How about select?
selected = array.select { |f| /.pom/.match(f) }
p selected
# => ["file_3.pom"]
Hope that helps!
In your case you can use the Enumerable#grep method to get an array of the elements that matches a pattern:
["file_1.jar", "file_2.jar", "file_3.pom"].grep(/\.pom\z/)
# => ["file_3.pom"]
As you can see I've also slightly modified your regular expression to actually match only strings that ends with .pom:
\. matches a literal dot, without the \ it matches any character\z anchor the pattern to the end of the string, without it the pattern would match .pom everywhere in the string.Since you are searching for a literal string you can also avoid regular expression altogether, for example using the methods String#end_with? and Array#select:
["file_1.jar", "file_2.jar", "file_3.pom"].select { |s| s.end_with?('.pom') }
# => ["file_3.pom"]
If you whant to keep only Strings witch responds on regexp so you can use Ruby method keep_if. But this methods "destroy" main Array.
a = ["file_1.jar", "file_2.jar","file_3.pom"]
a.keep_if{|file_name| /.pom/.match(file_name)}
p a
# => ["file_3.pom"]
.in/.pom/matches any character?