1 files changed, 48 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/pkg/matcher/string.go b/src/go/collectors/go.d.plugin/pkg/matcher/string.go
new file mode 100644
index 000000000..25827d0d8
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/pkg/matcher/string.go
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package matcher
+
+import (
+	"bytes"
+	"strings"
+)
+
+type (
+	// stringFullMatcher implements Matcher, it uses "==" to match.
+	stringFullMatcher string
+
+	// stringPartialMatcher implements Matcher, it uses strings.Contains to match.
+	stringPartialMatcher string
+
+	// stringPrefixMatcher implements Matcher, it uses strings.HasPrefix to match.
+	stringPrefixMatcher string
+
+	// stringSuffixMatcher implements Matcher, it uses strings.HasSuffix to match.
+	stringSuffixMatcher string
+)
+
+// NewStringMatcher create a new matcher with string format
+func NewStringMatcher(s string, startWith, endWith bool) (Matcher, error) {
+	switch {
+	case startWith && endWith:
+		return stringFullMatcher(s), nil
+	case startWith && !endWith:
+		return stringPrefixMatcher(s), nil
+	case !startWith && endWith:
+		return stringSuffixMatcher(s), nil
+	default:
+		return stringPartialMatcher(s), nil
+	}
+}
+
+func (m stringFullMatcher) Match(b []byte) bool          { return string(m) == string(b) }
+func (m stringFullMatcher) MatchString(line string) bool { return string(m) == line }
+
+func (m stringPartialMatcher) Match(b []byte) bool          { return bytes.Contains(b, []byte(m)) }
+func (m stringPartialMatcher) MatchString(line string) bool { return strings.Contains(line, string(m)) }
+
+func (m stringPrefixMatcher) Match(b []byte) bool          { return bytes.HasPrefix(b, []byte(m)) }
+func (m stringPrefixMatcher) MatchString(line string) bool { return strings.HasPrefix(line, string(m)) }
+
+func (m stringSuffixMatcher) Match(b []byte) bool          { return bytes.HasSuffix(b, []byte(m)) }
+func (m stringSuffixMatcher) MatchString(line string) bool { return strings.HasSuffix(line, string(m)) }