Function ExistInSliceWithRegex

tools/list/list.go:43–76

ExistInSliceWithRegex checks whether a string exists in a slice either by direct match, or by a regular expression (eg. `^\w+$`). Note: Only list items starting with '^' and ending with '$' are treated as regular expressions!

(str string, list []string)

//
// Note: Only list items starting with '^' and ending with '$' are treated as regular expressions!
func ExistInSliceWithRegex(str string, list []string) bool {
	for _, field := range list {
		isRegex := strings.HasPrefix(field, "^") && strings.HasSuffix(field, "$")

		if !isRegex {
			// check for direct match
			if str == field {
				return true
			}
			continue
		}

		// check for regex match
		pattern := cachedPatterns.Get(field)
		if pattern == nil {
			var err error
			pattern, err = regexp.Compile(field)
			if err != nil {
				continue
			}
			// "cache" the pattern to avoid compiling it every time
			// (the limit size is arbitrary and it is there to prevent the cache growing too big)
			//
			// @todo consider replacing with TTL or LRU type cache
			cachedPatterns.SetIfLessThanLimit(field, pattern, 500)
		}

		if pattern != nil && pattern.MatchString(str) {
			return true
		}
	}

	return false
}

// ToInterfaceSlice converts a generic slice to slice of interfaces.
func ToInterfaceSlice[T any](list []T) []any {