nvim-treesitter/tests/query/highlights/promql/regex.promql

foo{path=~"^foo$"}[5m] or
#          ^ @string.regexp
foo{path!~"[a-zA-Z0-9]{1,3}"}[5m] or
#          ^ @string.regexp
foo{path="/api/users/{userId}"}[5m] or
#         ^ @string
foo{path!="/api/users/{userId}"}[5m]
#          ^ @string

# vim: ft=promql
feat(promql): do not use regex for string labels (#7669) In Prometheus, label values are treated as strings when used with the `=` and `!=` operators, and as regular expressions when used with the `=~` and `!~` operators. Injecting and then highlighting all label values as regex leads to a situation where entirely valid string label values containing regex special characters are mistakenly parsed and highlighted as regex. This results in syntax errors, causing labels to be highlighted incorrectly. For example, in `foo{bar=~"[a-z]{1,3}"}`, `{` and `}` are regex special characters, so regex highlighting is expected. However, in `foo{path="/foo/{id}"}`, `{` and `}` are just part of the string and have no special meaning, so the whole value should be highlighted as a string. 2025-02-20 12:17:32 +01:00			`foo{path=~"^foo$"}[5m] or`
			`# ^ @string.regexp`
			`foo{path!~"[a-zA-Z0-9]{1,3}"}[5m] or`
			`# ^ @string.regexp`
			`foo{path="/api/users/{userId}"}[5m] or`
			`# ^ @string`
			`foo{path!="/api/users/{userId}"}[5m]`
			`# ^ @string`

			`# vim: ft=promql`