Regex w/ String Interpolation

General Usage
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1

I want to do something along the lines of:

a = "focus"
ismatch(r"$(a)\s*:\s*true", "# focus: true")

But this doesnt work // probably similar to issue #1797

What is the correct way to do this?

eval( parse( "ismatch(r\"$(a)\\s*:\\s*true\", \"# focus: true\")" ) )

feels super dirty

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2 
a = "focus"
r = Regex("$(a)\\s*:\\s*true")
ismatch(r, "# focus: true")
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