CODEWITHSUNDEEP
rubystring
Cesar Figueroa
Cesar Figueroa

Reputation: 214

Split and Modify Last

I have a string “shared/errors”, and I’d like for the the word “error” to be prepended with an underscore, so as to achieve “shared/_errors” Is there some ruby magic for doing this?

Upvotes: 1

Views: 73

Answers (4)

vgoff
vgoff

Reputation: 11323

Perhaps all answers are valid here, but I did see that OP references 'errors' by name. Rather than the slash.

string.gsub!('error', '_error') should change the original string, and do so, for all occurrences that may happen in the string. Of course, I have a feeling the slash is important, so perhaps the more correct string.gsub!('/error', '/_error') will do better.

Upvotes: 1

Borodin
Borodin

Reputation: 126742

Assuming there is only a single slash in the string, all that is necessary is

string.sub!(%r|(?<=/)|, '_')

or, if you prefer,

string.sub!('/', '/_')

If there are multiple slashes in the string and you only want to affect the last one, then you want

string.sub!(%r|(?=[^/]*\z)|, '_')

Upvotes: 2

Matt
Matt

Reputation: 14048

If you only want to do this on the last occurrence of the forward slash you can insert an underscore at the index of the slash:

string.insert(string.rindex('/') + 1, '_')

Upvotes: 1

feralin
feralin

Reputation: 3408

Why not

path = 'shared/errors' # or whatever it is
dir, file = path.match(/^(.*\/)([^/]*)$/).captures
path = dir + "_" + file

This will get the two parts of the string:

shared/errors ==> shared/ + errors

And then patch them back together to form the desired string.

Upvotes: 0

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