label_replace inverse matching

[Stevo Slavić]

Hello Prometheus users,

Does label_replace regex support negative lookahead?

I tried using as last parameter "^((?!foo).)*$" but get the error:

Error executing query: invalid regular expression in label_replace(): ^((?!foo).)*$

Same for "^(?!foo).*$"

Kind regards,

Stevo Slavic.

[Brian Brazil]

On Sat, 23 May 2020 at 13:25, Stevo Slavić <ssl...@gmail.com> wrote:

Hello Prometheus users,

Does label_replace regex support negative lookahead?

Prometheus uses Go's regexes which are RE2, and thus don't support negative lookahead. You can usually workaround by using negative regex matchers.

Brian

 

I tried using as last parameter "^((?!foo).)*$" but get the error:

Error executing query: invalid regular expression in label_replace(): ^((?!foo).)*$

Same for "^(?!foo).*$"

Kind regards,

Stevo Slavic.

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Brian Brazil

www.robustperception.io