[Rails] searching tables for a pattern that is in some other text

suppose I have a text file and I am looking for a pattern in that file
of the regex form: /^\s*#{label}\s*:?\s*(.*)/i
Where 'label' is a variable, but I want to do something like this:

labels.each do |lab|
if line =~ /^\s*#{lab}\s*:?\s*(.*)/i
matched = lab
end
end

If labels are stored in the database, is there a good faster way to do
this ?

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