Array with multiple symbol string split using regex grouping

Question

I'm trying to figure out the right regex to get the output as expected. It's a part of a bigger problem, and I'm stuck right here. I only want the array elements with the dot(.) notation in them and in the second part after the dot, if there is a symbol (@) group that separately as well.

(Input) arr = ["ab", "cd.ef", "gh.ij@kl"]

(Expecting) [["cd", "ef"], ["gh", "ij", "kl"]]

I have tried the following regex's to achieve this:

arr.join(",").scan(/(\w+)\.(\w+)@?(\w+)/) gives me [["cd", "e", "f"], ["gh", "ij", "kl"]]

Also, tried this:

arr.join(",").scan(/(\w+)\.(\w+)@(\w+)/) gives me ["gh", "ij", "kl"]]

Could someone please provide some guidance on how to get the expected outcome?

right now /(\w+)\.(\w+)@?(\w+)/ is causing it to capture the "f" separately so that it matches the pattern if you make that last capture group optional /(\w+)\.(\w+)@?(\w+)?/ you will get [["cd", "ef", ""], ["gh", "ij", "kl"]] — engineersmnky
– engineersmnky, Commented May 20, 2020 at 17:31
makes sense, making the part after @ optional is giving me the output i expect. thanks — shafiqsnss
– shafiqsnss, Commented May 20, 2020 at 17:46

ggorlen · Accepted Answer · 2020-05-20 17:48:10Z

2

I'd break it into two steps. First, you can grep all elements with a "." character, then map each to a split version of itself using your two delimiters:

arr = ["ab", "cd.ef", "gh.ij@kl"]
arr.grep(/\./).map{|e| e.split(/[@.]/)} # => [["cd", "ef"], ["gh", "ij", "kl"]]

If you need to be sure that @ is permitted in the first section of the split, you could try something like

arr = ["[email protected]@garply"]
pat = /([^.]+)\.([^@]+)(?:@(.+))?/
arr.grep(/\./).map{|e| e.scan(pat).flatten.compact} # => [["foo@bar", "baz", "garply"]]

edited May 20, 2020 at 17:48

answered May 20, 2020 at 17:20

ggorlen

59.4k8 gold badges119 silver badges173 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Array with multiple symbol string split using regex grouping

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related