all: fix default regex match license and copyright to ignore comment

Instead of assuming that the comment prefix and space always exists

  "^(//)\s+..."

change it to be optional, so it will works on the multi-line comment.
For example, comment and old headers in html,

  <--
  Copyright ...
  -->

there is no comment prefix and space.

1 files changed, 3 insertions, 1 deletions

diff --git a/file.go b/file.go
index 7849d9e..798790c 100644
--- a/file.go
+++ b/file.go
@@ -187,18 +187,20 @@ func (f *file) scanCopyrightText(conv *SPDXConv) {
 			}
 			if cmc.match(string(line)) {
 				f.idxCopyrightText = x
+				f.copyrightYear = cmc.year
 				f.copyrightText = valMatch
 				return
 			}
 		}
 		for x, line := range f.bottomLines {
-			if reLicenseID.Match(line) {
+			if reCopyrightText.Match(line) {
 				f.idxCopyrightText = x - conv.cfg.MaxLineMatch
 				f.copyrightText = valExist
 				return
 			}
 			if cmc.match(string(line)) {
 				f.idxCopyrightText = x - conv.cfg.MaxLineMatch
+				f.copyrightYear = cmc.year
 				f.copyrightText = valMatch
 				return
 			}