Error with redact() function - regex parse error: look-around, including look-ahead and look-behind, is not supported: ^^^:

[JustinJKelly]

I am currently on vector version v0.34.0. Has this feature been added between current release and v0.34.0? Thanks!

[jszwedko]

Hey! Unfortunately it has not. This regex library Vector uses puts an emphasis on bounded performance of regular expressions and those sorts of regex operations (lookaround and backreferences) can explode the computation required. This is mentioned in the library documentation:

This crate provides routines for searching strings for matches of a regular expression (aka “regex”). The regex syntax supported by this crate is similar to other regex engines, but it lacks several features that are not known how to implement efficiently. This includes, but is not limited to, look-around and backreferences. In exchange, all regex searches in this crate have worst case O(m * n) time complexity, where m is proportional to the size of the regex and n is proportional to the size of the string being searched.

https://docs.rs/regex/latest/regex/

If you really need it, and are ok with subpar and potentially unbounded execution, you could drop down into Lua via the lua transform. I believe you can use PCRE there.

[JustinJKelly]

@jszwedko Thanks for the info! I will check out lua.