Subcommand of [dict] that returns a subset of a dictionary according to some filtering rule.
    :   '''dict filter''' ''dictionaryValue'' '''key''' ''globPattern''
    :   '''dict filter''' ''dictionaryValue'' '''value''' ''globPattern''
    :   '''dict filter''' ''dictionaryValue'' '''script {''' ''keyVar valueVar'' '''}''' ''script''
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[HaO]: an example session with the script option:

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% set d [dict filter {k1 v1 k2 v2} script {k v} {return [expr {$k eq "k1"}]}]
1
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So return might not be the right command. It stops the script and nothing is assigned to d.

Lets try without it:
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% set d [dict filter {k1 v1 k2 v2} script {k v} {expr {$k eq "k1"}}]
k1 v1
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That worked !

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!!!!!!
%| [Category Command] |%
!!!!!!