@@ -385,8 +385,15 @@ func (r *releaseCommand) autoversionFile(ctx context.Context, file, channel, ver
385385// Utilize the index where the match was found to replace the correct part. The only
386386// match group is the version.
387387if match := matchRe .FindStringSubmatchIndex (line );match != nil {
388- logger .Info (ctx ,"updating version number" ,"line_number" ,i + 1 ,"match" ,match ,"old_version" ,line [match [2 ]:match [3 ]])
389- lines [i ]= line [:match [2 ]]+ version + line [match [3 ]:]
388+ vg := matchRe .SubexpIndex ("version" )
389+ if vg == - 1 {
390+ logger .Error (ctx ,"version group not found in match" ,"num_subexp" ,"match" ,match ,matchRe .NumSubexp (),"subexp_names" ,matchRe .SubexpNames ())
391+ return xerrors .Errorf ("bug: version group not found in match" )
392+ }
393+ start := match [vg * 2 ]
394+ end := match [vg * 2 + 1 ]
395+ logger .Info (ctx ,"updating version number" ,"line_number" ,i + 1 ,"match_start" ,start ,"match_end" ,end ,"old_version" ,line [start :end ])
396+ lines [i ]= line [:start ]+ version + line [end :]
390397matchRe = nil
391398break
392399}