Finish config mapping

internal/config/v1.go

@@ -12,6 +12,7 @@ func loadV1Config(content []byte) (*ZurgConfigV1, error) {
 	if err := yaml.Unmarshal(content, &configV1); err != nil {
 		return nil, err
 	}
+
 	return &configV1, nil
 }
 
@@ -52,7 +53,7 @@ func (z *ZurgConfigV1) matchFilter(fileID, torrentName string, filter *FilterCon
 		return true
 	}
 	if filter.RegexStr != "" {
-		regex := regexp.MustCompile(filter.RegexStr)
+		regex := compilePattern(filter.RegexStr)
 		if regex.MatchString(torrentName) {
 			return true
 		}
@@ -88,3 +89,39 @@ func (z *ZurgConfigV1) matchFilter(fileID, torrentName string, filter *FilterCon
 	}
 	return false
 }
+
+func compilePattern(pattern string) *regexp.Regexp {
+	flags := map[rune]string{
+		'i': "(?i)",
+		'm': "(?m)",
+		's': "(?s)",
+		'x': "(?x)",
+	}
+
+	lastSlash := strings.LastIndex(pattern, "/")
+	secondLastSlash := strings.LastIndex(pattern[:lastSlash], "/")
+
+	// Extract the core pattern
+	corePattern := pattern[secondLastSlash+1 : lastSlash]
+
+	// Extract and process flags
+	flagSection := pattern[lastSlash+1:]
+	flagString := ""
+	processedFlags := make(map[rune]bool)
+	for _, flag := range flagSection {
+		if replacement, ok := flags[flag]; ok && !processedFlags[flag] {
+			flagString += replacement
+			processedFlags[flag] = true
+		}
+	}
+
+	// Combine the processed flags with the core pattern
+	finalPattern := flagString + corePattern
+
+	// Validate pattern
+	if finalPattern == "" || finalPattern == flagString {
+		return nil
+	}
+
+	return regexp.MustCompile(finalPattern)
+}