from Perl Cookbook - what is single quote in brackets

[Nevada]

Hello,

In the Perl Cookbook recipe 1.14 - "Properly Capitalizing a Title or
Headline" I see this substitution:

   s/(\pL[\pL']*)/$nocap{$1} ? lc($1) : ucfirst(lc($1))/ge;

if a word appears in the nocap hash, it is made lower case. the \pL
matches a lower case character but what is [\pL']?

Thanks,

NS


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