proof of concept

  DB<137> %lexicon=("day"=>1,"night"=>2,"knight"=>3)
 => ("day", 1, "night", 2, "knight", 3)

  DB<138> $pattern = join "|",sort {length($b)<=>length( $a) } keys %l
+exicon
 => "knight|night|day"

  DB<139> $tweet= "today I will knight a guy I met last night"
 => "today I will knight a guy I met last night"

  DB<140> @matches =  ( $tweet =~ /($pattern)/g )
 => ("day", "knight", "night")

  DB<141>  @lexicon{@matches}
 => (1, 3, 2)

[download]

if you need word boundaries try map { "\\b$_\\b" } between join and sort

  DB<146> $pattern = join "|", map { "\\b$_\\b" } sort {length($b)<=>l
+ength( $a) } keys %lexicon
 => "\\bknight\\b|\\bnight\\b|\\bday\\b"

  DB<147> @matches =  ( $tweet =~ /($pattern)/g )
 => ("knight", "night")

[download]

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^2: Efficient matching with accompanying data by LanX
in thread Efficient matching with accompanying data by Endless

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