From: duerst@... Date: 2017-12-30T04:37:34+00:00 Subject: [ruby-core:84559] [Ruby trunk Feature#13890] Allow a regexp as an argument to 'count', to count more interesting things than single characters Issue #13890 has been updated by duerst (Martin D��rst). Python allows to count strings, as follows: `str.count(sub[, start[, end]])` Return the number of non-overlapping occurrences of `substring` `sub` in the range `[start, end]`. Optional arguments `start` and `end` are interpreted as in slice notation. ---------------------------------------- Feature #13890: Allow a regexp as an argument to 'count', to count more interesting things than single characters https://bugs.ruby-lang.org/issues/13890#change-69097 * Author: duerst (Martin D��rst) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- Currently, String#count only accepts strings, and counts all the characters in the string. However, I have repeatedly met the situation where I wanted to count more interesting things in strings. These 'interesting things' can easily be expressed with regular expressions. Here is a quick-and-dirty Ruby-level implementation: ````Ruby class String alias old_count count def count (what) case what when String old_count what when Regexp pos = -1 count = 0 count += 1 while pos = index(what, pos+1) count end end end ```` Please note that the implementation counts overlapping occurrences; maybe there is room for an option like `overlap: :no`. -- https://bugs.ruby-lang.org/ Unsubscribe: