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`Full
Changelog <https://github.com/zalando/expan/compare/v0.4.4...v0.4.5>`__
**Fixed bugs:**
- Numbers cannot appear in variable names for derived metrics
`58 <https://github.com/zalando/expan/issues/58>`__
**Merged pull requests:**
- Feature/results and to json refactor
`74 <https://github.com/zalando/expan/pull/74>`__
(`mkolarek <https://github.com/mkolarek>`__)
- Merge to\_json() and prob\_uplift\_over\_zero changes
`72 <https://github.com/zalando/expan/pull/72>`__
(`mkolarek <https://github.com/mkolarek>`__)
- regex fix, see https://github.com/zalando/expan/issues/58
`70 <https://github.com/zalando/expan/pull/70>`__
(`gbordyugov <https://github.com/gbordyugov>`__)