util

func AllNonGreedy ¶

func AllNonGreedy(regs ...*syntax.Regexp)

AllNonGreedy turns greedy quantifiers such as `.*` and `.+` into non-greedy ones. This is the same effect as writing `.*?` and `.+?`. This is only safe because we use `Match`. If we were to find the exact position and length of the match we would not be allowed to make this optimization. `Match` can return quicker because it is not looking for the longest match. Prepending the expression with `(?U)` or passing `NonGreedy` to the expression compiler is not enough since it will just negate `.*` and `.*?`.

func ClearCapture ¶

func ClearCapture(regs ...*syntax.Regexp)

ClearCapture removes capture operation as they are not used for filtering.

func IsCaseInsensitive ¶

func IsCaseInsensitive(reg *syntax.Regexp) bool

func SplitFiltersAndMatchers ¶

func SplitFiltersAndMatchers(allMatchers []*labels.Matcher) (filters, matchers []*labels.Matcher)

SplitFiltersAndMatchers splits empty matchers off, which are treated as filters, see #220