Now also converting the `getPathFor()` method over to use `preg_replace_callback()` instead of `preg_match_all()`.
Now also converting the `getPathFor()` method over
to use `preg_replace_callback()` instead of `preg_match_all()`.

This switch should provide the same benefits as the switch made in the
`compileRoute()` method, while also providing a more consistent regular
expression processing style.

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