pent

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Since the regex is deterministic from the patterns/Patterns, it might as well be compiled once, at whatever time the properties are set.

Can then return the string or pattern object from the property, from a private var, and the generated regex pattern strings could also be stored in various ways, internally.

However: Since the regex pattern compilation at this point has two flags that change the capture-group insertion behavior, pre-compilation of the patterns may be more convoluted than would be useful.