Inserting regex into literal regex expressions

Evolution Pitches
1

I could not find this in another topic.... When a regex has been declared e.g. via a literal expression:

let greeting = /(hello|hi)/

Then it can be nice to use this in another regex (this does work today):

let greetingSomeone = Regex {
    greeting
    ChoiceOf{ " "; ", " }
    OneOrMore { .word }
}

Why not make it possible to insert the greeting regex directly into a literal regex (the syntax might have to be different):

let greetingSomeone = /\(greeting)( |, )\w+/

What do you think?

Update: Added ticket Inserting regex into literal regex expressions · Issue #821 · swiftlang/swift-experimental-string-processing · GitHub.

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