Some regex engines cannot handle separate parsing (due to need of a state machine to track next continued line) broken down due to [prior] end-of-line notation.

Some regex engines cannot handle separate parsing (due to need of a state machine to track next continued line) broken down due to [prior] end-of-line notation. and most regex engines cannot handling labels of assignments for later reuse within its expression. It is however still useful to leverage a higher language to do the constructing of a final regex pattern from repeated patterns (basic building block) prior to engine usages.