I have this weird behaviour of a huge regexp.  `$a` and `$b` are identical, except for two quote characters added to the list of permitted suffix characters in `$b`.  Yet,  with `$b`, the suffix suddenly matches `</dl>`, which it doesn't in `$a`.
```
irb(main):024:0> $a
=> /text(?<suffix>[\p{alpha}'-]*(<\/(a|em|strong)>)*)(?=[^\p{alpha}'-]|$)/
irb(main):025:0> $a =~ 'textnoot</dl>mies'
=> 0
irb(main):026:0> $~
=> #<MatchData "textnoot" suffix:"noot">
irb(main):027:0> $b=/text(?<suffix>[\p{alpha}'-#{$codes['rsquo']+$codes['rdquo']}]*(<\/(a|em|strong)>)*)(?=[^\p{alpha}'-]|$)/
=> /text(?<suffix>[\p{alpha}'-\u2019\u201D]*(<\/(a|em|strong)>)*)(?=[^\p{alpha}'-]|$)/
irb(main):028:0> $b =~ 'textnoot</dl>mies'
=> 0
irb(main):029:0> $~
=> #<MatchData "textnoot</dl>mies" suffix:"noot</dl>mies">
```