xeger
ulid
| xeger | ulid | |
|---|---|---|
| - | 4 | |
| 122 | 709 | |
| - | - | |
| 1.3 | 0.0 | |
| over 1 year ago | almost 2 years ago | |
| Python | Python | |
| BSD 3-clause "New" or "Revised" License | Apache License 2.0 |
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xeger
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Tracking mentions began in Dec 2020.
ulid
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Plan B for UUIDs: double AES-128
I really like ULID for this problem (e.g: https://github.com/ahawker/ulid)
- same number of bytes as UUID
- start with a date, so has great locality. Plus you get extra information in the uid that you can extract.
- can be created from an existing date or uuid, and exported to a uuid, so there is a migration path
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New UUID Formats from IETF
As the author of a popular ULID implementation in python[1], the spec has no stewardship anymore. The specification repo[2] has plenty of open issues and no real guidance or communication beyond language implementation authors discussing corner cases. The monotonic functionality is ambiguous (at best) and is implemented differently per-languages [3].
Functionality, UUIDv7 might be the _same_ but the hope would be for a more rigid specification for interoperability.
[1]: https://github.com/ahawker/ulid
[2]: https://github.com/ulid/spec
[3]: https://github.com/ulid/spec/issues/11
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Sortable Collision-Free UUIDs
Looks similar to ULID[0] (I am the author of a popular python implementation[1]).
It appears to have a similar constraint that two ID's generated within the same timestamp (ms, ns) have no strong guarantee of ordering. That might not be a deal breaker depending on your use case but something to consider.
* https://github.com/ulid/spec
* https://github.com/ahawker/ulid
- Usando ULIDs para criar ordem em dados não ordenados
What are some alternatives?
EXREX - Irregular methods on regular expressions
python-ulid - ULID implementation for Python
uuid - Generate RFC-compliant UUIDs in JavaScript
marc - Markov chain generator for Python and/or Swift
ksuid - K-Sortable Globally Unique IDs
essential-generators - Dead Simple Document Generation
HotBits Python API - Python API for HotBits random data generator
spec - The canonical spec for ulid
edify - Regular Expressions Made Simple.