Bareword found where operator expected at test_highlight.pl line 21, near ""<b>" . encode_entities("$2") . "</b"
  (Might be a runaway multi-line // string starting on line 13)
        (Missing operator before b?)
Scalar found where operator expected at test_highlight.pl line 22, near ": encode_entities("$3"
  (Might be a runaway multi-line "" string starting on line 21)
        (Missing operator before $3?)
String found where operator expected at test_highlight.pl line 28, near "print text_to_html(""
  (Might be a runaway multi-line "" string starting on line 22)
        (Missing semicolon on previous line?)
Bareword found where operator expected at test_highlight.pl line 28, near "print text_to_html("best"
        (Do you need to predeclare print?)
syntax error at test_highlight.pl line 21, near ""<b>" . encode_entities("$2") . "</b"
Can't find string terminator '"' anywhere before EOF at test_highlight.pl line 28.

##</code><code>##

"<\/b>"