Add proper error checking on regexps

internal/config/v1.go

@@ -1,19 +1,21 @@
 package config
 
 import (
+	"fmt"
 	"regexp"
 	"sort"
 	"strings"
 
+	"go.uber.org/zap"
 	"gopkg.in/yaml.v3"
 )
 
-func loadV1Config(content []byte) (*ZurgConfigV1, error) {
+func loadV1Config(content []byte, log *zap.SugaredLogger) (*ZurgConfigV1, error) {
 	var configV1 ZurgConfigV1
 	if err := yaml.Unmarshal(content, &configV1); err != nil {
 		return nil, err
 	}
-
+	configV1.log = log
 	return &configV1, nil
 }
 
@@ -84,7 +86,11 @@ func (z *ZurgConfigV1) matchFilter(torrentName string, torrentIDs, fileNames []s
 		}
 	}
 	if filter.RegexStr != "" {
-		regex := compilePattern(filter.RegexStr)
+		regex, err := compilePattern(filter.RegexStr)
+		if err != nil {
+			z.log.Errorf("Failed to compile regex: %v", err)
+			return false
+		}
 		if regex.MatchString(torrentName) {
 			return true
 		}
@@ -119,7 +125,11 @@ func (z *ZurgConfigV1) matchFilter(torrentName string, torrentIDs, fileNames []s
 		}
 	}
 	if filter.FileInsideRegexStr != "" {
-		regex := compilePattern(filter.FileInsideRegexStr)
+		regex, err := compilePattern(filter.FileInsideRegexStr)
+		if err != nil {
+			z.log.Errorf("Failed to compile regex: %v", err)
+			return false
+		}
 		for _, filename := range fileNames {
 			if regex.MatchString(filename) {
 				return true
@@ -143,7 +153,7 @@ func (z *ZurgConfigV1) matchFilter(torrentName string, torrentIDs, fileNames []s
 	return false
 }
 
-func compilePattern(pattern string) *regexp.Regexp {
+func compilePattern(pattern string) (*regexp.Regexp, error) {
 	flags := map[rune]string{
 		'i': "(?i)",
 		'm': "(?m)",
@@ -173,8 +183,8 @@ func compilePattern(pattern string) *regexp.Regexp {
 
 	// Validate pattern
 	if finalPattern == "" || finalPattern == flagString {
-		return nil
+		return nil, fmt.Errorf("invalid regex pattern: %s", pattern)
 	}
 
-	return regexp.MustCompile(finalPattern)
+	return regexp.Compile(finalPattern)
 }