How to "compose" regexes when writing literals?

Suppose one use a regex as a building block. When using RegexBuilder, one just writes Regex {ā€¦}. My question is whether it is possible to do this when writing regex literals.

Sry for the late reply,
Iā€™m not sure I fully understand, but you can freely write regex literals with RegexBuilder.
Literals are just a convinient way to represent an object.
from the Regex Tutorial you can see the first code block in " Capturing Matches" is a big Regex { ā€¦ } that contains a literal inside it for the new lines.