From: "Hanmac (Hans Mackowiak)" Date: 2021-09-16T13:36:12+00:00 Subject: [ruby-core:105299] [Ruby master Feature#18172] MatchData#sublen to return the length of a substring Issue #18172 has been updated by Hanmac (Hans Mackowiak). @nobu, isn't your `MatchData#match` the same as `MatchData#[]` ? ---------------------------------------- Feature #18172: MatchData#sublen to return the length of a substring https://bugs.ruby-lang.org/issues/18172#change-93709 * Author: nobu (Nobuyoshi Nakada) * Status: Closed * Priority: Normal ---------------------------------------- There are many code taking the length of a substring matched by `Regexp`. For instance, in rdoc/markup/attribute_manager.rb: ```ruby attr_updated = attrs.set_attrs($`.length + $1.length + $2.length, $3.length, attr) if attr_updated $1 + NULL * $2.length + $3 + NULL * $2.length + $4 ``` People often tends to use such code (although the first addition can be simpler as `$~.begin(3)`), that creates and soon drops substrings, just to take the length. Therefore, how about the new method to calculate the length, `MatchData#sublen`? ```ruby /(\d+)\W(\w+)/ =~ "1:foo" $~.sublen(1) #=> 1 $~.sublen(2) #=> 3 ``` -- https://bugs.ruby-lang.org/ Unsubscribe: