From: duerst@... Date: 2019-01-04T06:46:44+00:00 Subject: [ruby-core:90884] [Ruby trunk Feature#15496] Extract between string as standard String api Issue #15496 has been updated by duerst (Martin D��rst). macdevign (Macdevign mac) wrote: > Given that string "between" extraction is such a common operation, Can you back that up with some additional information/data? For example, do you know other programming languages that have such a function/method? I haven't had the need for such a method, and use cases I can think of very quickly need additional or different parameters (such as xth occurrence, between (Regexp) patterns rather than simple strings, before or after a string,...), which suggests to me that solving this specific problem with the general regular expression functionality already in Ruby. ---------------------------------------- Feature #15496: Extract between string as standard String api https://bugs.ruby-lang.org/issues/15496#change-76071 * Author: macdevign (Macdevign mac) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- I could not find the a simple String api to extract the string between two string, and I notice that many face the same issue and endup rolling their own solutions (eg https://stackoverflow.com/questions/9661478/how-to-return-the-substring-of-a-string-between-two-strings-in-ruby). Given that string "between" extraction is such a common operation, will adding a focused and simplified String method make coding pleasant ? This is my solution but probably someone can provide better and efficient implementation. ~~~ # self: String instance, # from: first 'from' String # to: first 'to' String found after 'from' # return string between from and to, which exclude the argument, nil otherwise. def between(from, to) from_idx = self.index(from)&.+(from.length) if from_idx to_idx = self.index(to, from_idx) return self[from_idx...to_idx] if to_idx end nil end ~~~ Test case "Hello world".between("ell", "ld") => "o wor" "Testing 123".between("Te", "123") => "sting " -- https://bugs.ruby-lang.org/ Unsubscribe: