How do I extract tags and retrieve values

Tita has asked for the wisdom of the Perl Monks concerning the following question:

I have this in a file:

<s>/SYM Who/WP is/VBZ the/DT author/NN of/IN the/DT book/NN...  ?/. </
+s>/SYM.
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How I extract just the tags to make a formula (ex: WP+VBZ+DT..), and how I will retrieve just the value of the tag (WP ->Who...), after I match (true) with other formulas I have in another file?

Originally posted as a Categorized Question.

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