Avoid API break

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

pkg/labels/matcher.go

@@ -111,6 +111,13 @@ func (m *Matcher) Inverse() (*Matcher, error) {
 	panic("labels.Matcher.Matches: invalid match type")
 }
 
+func (m *Matcher) GetRegexString() string {
+	if m.re == nil {
+		return ""
+	}
+	return m.re.GetRegexString()
+}
+
 // SetMatches returns a set of equality matchers for the current regex matchers if possible.
 // For examples the regexp `a(b|f)` will returns "ab" and "af".
 // Returns nil if we can't replace the regexp by only equality matchers.

pkg/labels/regexp.go

@@ -61,6 +61,7 @@ func findSetMatches(re *syntax.Regexp, base string) []string {
 	if isCaseInsensitive(re) {
 		return nil
 	}
+	clearBeginEndText(re)
 	switch re.Op {
 	case syntax.OpLiteral:
 		return []string{base + string(re.Rune)}
@@ -108,7 +109,6 @@ func findSetMatchesFromConcat(re *syntax.Regexp, base string) []string {
 	if len(re.Sub) == 0 {
 		return nil
 	}
-	clearBeginEndText(re)
 	clearCapture(re.Sub...)
 	matches := []string{base}
 
@@ -209,6 +209,10 @@ func (m *FastRegexMatcher) SetMatches() []string {
 	return m.setMatches
 }
 
+func (m *FastRegexMatcher) GetRegexString() string {
+	return m.re.String()
+}
+
 // optimizeConcatRegex returns literal prefix/suffix text that can be safely
 // checked against the label value before running the regexp matcher.
 func optimizeConcatRegex(r *syntax.Regexp) (prefix, suffix, contains string) {