Update `titlelize` regex to allow apostrophes

In 4b685aa the regex in `titlelize` was updated to not match
apostrophes to better reflect the nature of the transformation.
Unfortunately this had the side effect of breaking capitalization
on the first word of a sub-string, e.g:

  >> "This was 'fake news'".titleize
  => "This Was 'fake News'"

This is fixed by extending the look-behind to also check for a
word character on the other side of the apostrophe.

Fixes #28312.

1 files changed, 1 insertions, 1 deletions

diff --git a/activesupport/lib/active_support/inflector/methods.rb b/activesupport/lib/active_support/inflector/methods.rb
index 8ccb735c6d..51c221ac0e 100644
--- a/activesupport/lib/active_support/inflector/methods.rb
+++ b/activesupport/lib/active_support/inflector/methods.rb
@@ -161,7 +161,7 @@ module ActiveSupport
     #   titleize('TheManWithoutAPast')       # => "The Man Without A Past"
     #   titleize('raiders_of_the_lost_ark')  # => "Raiders Of The Lost Ark"
     def titleize(word)
-      humanize(underscore(word)).gsub(/\b(?<!['’`])[a-z]/) { |match| match.capitalize }
+      humanize(underscore(word)).gsub(/\b(?<!\w['’`])[a-z]/) { |match| match.capitalize }
     end
 
     # Creates the name of a table like Rails does for models to table names.