1 files changed, 52 insertions, 0 deletions
diff --git a/match_copyright.go b/match_copyright.go
new file mode 100644
index 0000000..aa35950
--- /dev/null
+++ b/match_copyright.go
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info>
+
+package spdxconv
+
+import (
+	"fmt"
+	"regexp"
+)
+
+type matchCopyright struct {
+	rePattern *regexp.Regexp
+
+	// Pattern to be searched in file.
+	Pattern string `ini:"match-copyright::pattern"`
+
+	year    string
+	author  string
+	contact string
+}
+
+func (cmc *matchCopyright) init() (err error) {
+	var logp = `match-copyright`
+	if cmc.Pattern != `` {
+		cmc.rePattern, err = regexp.Compile(cmc.Pattern)
+		if err != nil {
+			return fmt.Errorf(`%s: pattern %q: %w`, logp, cmc.Pattern, err)
+		}
+	}
+	return nil
+}
+
+func (cmc *matchCopyright) match(line string) bool {
+	matches := cmc.rePattern.FindStringSubmatch(line)
+	if len(matches) == 0 {
+		return false
+	}
+	namedMatches := map[string]string{}
+	for x, name := range cmc.rePattern.SubexpNames() {
+		if x != 0 && name != `` {
+			namedMatches[name] = matches[x]
+		}
+	}
+	cmc.year = namedMatches[`year`]
+	cmc.author = namedMatches[`author`]
+	cmc.contact = namedMatches[`contact`]
+	return len(namedMatches) >= 1
+}
+
+func (cmc *matchCopyright) String() string {
+	return fmt.Sprintf(`%s <%s>`, cmc.author, cmc.contact)
+}