Glob syntax
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 support glob syntax, whereas recording rules support regular expression syntax.
Glob patterns specify sets of filenames with wildcard characters. The most common
wildcards are *, ?, and […]. You can negate any pattern by prefixing it with a
!.
Observability Platform glob syntax doesn’t support using two asterisks where one of
them is in the middle of a string. For example, *k8s*staging isn’t valid.
| Wildcard | Description | Example | Matches | Doesn’t match |
|---|---|---|---|---|
* | Matches any number of any characters, including none. | Law* *Law* L*aw | Law, Laws, or Lawyer Law, GrokLaw, or Lawyer Law or Laaw | GrokLaw, La, or aw La or aw La or Laws |
? | Matches any single character. | ?at | Cat, cat, Bat, or bat | at |
[abc] | Matches one character given in the bracket. | [CB]at | Cat or Bat | cat, bat, or CBat |
[a-z] | Matches one character from the (locale-dependent) range given in the bracket. | Letter[0-9] | Letter0, Letter1, Letter2, up to Letter9 | Letters, Letter, or Letter10 |
{a,b} | Matches one word given in the braces. | {pass,word} | pass, word | password, passing |
Table sourced from Wikipedia (opens in a new tab).
For more pattern matching specifics, see the Glob primer (opens in a new tab).