check vtt using prefix and suffix instead of regex

files/file.go

@@ -14,7 +14,6 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-	"regexp"
 	"strings"
 	"time"
 
@@ -272,28 +271,19 @@ func (i *FileInfo) detectSubtitles() {
 	i.Subtitles = []string{}
 	ext := filepath.Ext(i.Path)
 
-	// detect multiple languages. Base.Lang.vtt
+	// detect multiple languages. Base*.vtt
 	// TODO: give subtitles descriptive names (lang) and track attributes
 	afs := &afero.Afero{Fs: i.Fs}
 	parentDir := strings.TrimRight(i.Path, i.Name)
 	dir, err := afs.ReadDir(parentDir)
 	if err == nil {
 		base := strings.TrimSuffix(i.Name, ext)
-		r := regexp.MustCompile("^" + regexp.QuoteMeta(base) + `\.(.*\.)?vtt$`)
 		for _, f := range dir {
-			if !f.IsDir() {
-				if matches := r.FindStringSubmatch(f.Name()); len(matches) == 2 {
-					i.Subtitles = append(i.Subtitles, path.Join(parentDir, matches[0]))
+			if !f.IsDir() && strings.HasPrefix(f.Name(), base) && strings.HasSuffix(f.Name(), ".vtt") {
+				i.Subtitles = append(i.Subtitles, path.Join(parentDir, f.Name()))
 			}
 		}
 	}
-		return
-	}
-
-	fPath := strings.TrimSuffix(i.Path, ext) + ".vtt"
-	if _, err := i.Fs.Stat(fPath); err == nil {
-		i.Subtitles = append(i.Subtitles, fPath)
-	}
 }
 
 func (i *FileInfo) readListing(checker rules.Checker, readHeader bool) error {