prow/config/jobs.go
func ClearCompiledRegexes(presubmits []Presubmit) {
	for i := range presubmits {
		presubmits[i].re = nil
		presubmits[i].Brancher.re = nil
		presubmits[i].Brancher.reSkip = nil
		presubmits[i].RegexpChangeMatcher.reChanges = nil
	}
}
func ClearCompiledRegexes(presubmits []Presubmit) {
	for i := range presubmits {
		presubmits[i].re = nil
		presubmits[i].Brancher.re = nil
		presubmits[i].Brancher.reSkip = nil
		presubmits[i].RegexpChangeMatcher.reChanges = nil
	}
}
// ClearCompiledRegexes removes compiled regexes from the presubmits,
// useful for testing when deep equality is needed between presubmits