use compiled regex

I don't think that any of the regex code in this module is on the hotpath but we could potentially change our String.replaceAll(regex, newValue) calls with:
```
import java.util.regex.Pattern

val UNDERSCORE_OR_DOT = Pattern.compile("[_.]")
val Pattern INVALID_CHARS = Pattern.compile("[^-a-z0-9]")

val str: String = ...
val withHyphens = UNDERSCORE_OR_DOT.matcher(lower).replaceAll("-")
val normalized = INVALID_CHARS.matcher(withHyphens).replaceAll("")
```

There are 5 or 6 different regexes that could be looked at.

Start by locating the five or six regex uses in the module, especially the String.replaceAll calls described in the issue. Compare the existing replacements with compiled java.util.regex.Pattern usage, then run the relevant existing tests to confirm behavior is unchanged for underscore, dot, and invalid-character normalization.

Written by the indexing model from the issue text.