> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chronosphere.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Regular expressions

<Note>
  Regular expression syntax and glob syntax are not interchangeable. Chronosphere
  Observability Platform supports only one of these query matching patterns in
  supported areas of the product. For example,
  [drop rules](/control/shaping/shape-metrics/rules/drop-rules#create-a-drop-rule) support glob
  syntax, whereas [recording rules](/control/shaping/shape-metrics/rules/recording) support
  regular expression syntax.
</Note>

All regular expressions in Prometheus use [RE2 syntax](https://github.com/google/re2/wiki/Syntax).
Chronosphere Observability Platform supports RE2 syntax compatibility with Prometheus
for queries using regular expressions in the following areas:

* [Changes Explorer](/investigate/querying/filter-events)
* [Dashboards](/observe/dashboards)
* [Lens configuration](/administer/service-discovery)
* [Metrics Explorer](/investigate/querying/metrics/explorer)
* [Monitors](/investigate/alerts/monitors#use-annotations-with-monitors)
* [Muting rules](/investigate/alerts/muting-rules#match-on-values-using-regular-expressions)
* [Recording rules](/control/shaping/shape-metrics/rules/recording)
* [Trace Explorer](/investigate/querying/traces)

<Note>
  Because the implementation of this parser is customized, the syntax might vary in
  some instances.
</Note>