If I understand your question and your use of the word "tokenize" correctly, you just need a regex where all names are ORed.

The regex engine is already trie optimized.

updated

now that I'm back to a desktop computer let's try...

  DB<105> %names =(
           '&#32431;&#12385;&#12419;&#12435;' => 2,
           '&#21608;&#26480;&#20523;' => 57,
           'Alex Fong' => 100,
           )

  DB<106> $input=q{"Esther Kwan, &#32431;&#12385;&#12419;&#12435; | Al
+ex Fong (Hong Kong) / Joe Smith ; Fong &#21608;&#26480;&#20523; Feren
+c Kállai"}

  DB<107> $regex = join '|', keys %names

  DB<108> @matches = ( $input =~ /($regex)/g )

  DB<110> print join ",", @matches
&#32431;&#12385;&#12419;&#12435;,Alex Fong,&#21608;&#26480;&#20523;

[download]

here pre formated to display unicodes characters...

  DB<105> %names =(
           '纯ちゃん' => 2,
           '周杰倫' => 57,
           Alex Fong => 100,
           )


  DB<106> $input=q{"Esther Kwan, 纯ちゃん | Alex Fong (Hong Kong) / Joe Smith ; Fong 周杰倫 Ferenc Kállai"}


  DB<107> $regex = join '|', keys %names


  DB<108> @matches = ( $input =~ /($regex)/g )


  DB<110> print join ",", @matches
纯ちゃん,Alex Fong,周杰倫

update

reading your task description again I doubt that your teacher will accept this approach as homework! =)

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re: How to tokenize string by custom dictionary? (+code) by LanX
in thread How to tokenize string by custom dictionary? by infantcoder

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