Fix usage of - in stripChars with the introduction of RE2

[stephenamar-db]

With this PR, I fix a regression introduced with the migration to RE2.

• If there's a - in the chars in the *stripchars functions, we move it to the end
• explicitely use RE2 with scala native (instead of the thin wrapper around it), which then allows us to
• Enable stripchars test cases for jvm, js & native.