Method code for $trie.match_exact()

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arg trie, key;
var n, t;

if (trie[1] && key == trie[1][1])
    return trie[1];
if (!key || !(n = key[1] in trie[2]))
    throw(~keynf, "Trie: key not found.");
(> (t = .match_exact(trie[n + 2], key.subrange(2))) <);
t = t.replace(1, key[1] + t[1]);
return t;

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["// Miroslav Silovic ", "// Created 09-May-1995 as a part of ColdCore, see: @help Credit"]