allow using colon in path names (#4377) (#4519)

internal/conf/path.go

@@ -14,7 +14,7 @@ import (
 	"github.com/bluenviron/mediamtx/internal/logger"
 )
 
-var rePathName = regexp.MustCompile(`^[0-9a-zA-Z_\-/\.~]+$`)
+var rePathName = regexp.MustCompile(`^[0-9a-zA-Z_\-/\.~:]+$`)
 
 // IsValidPathName checks whether the path name is valid.
 func IsValidPathName(name string) error {
@@ -31,7 +31,7 @@ func IsValidPathName(name string) error {
 	}
 
 	if !rePathName.MatchString(name) {
-		return fmt.Errorf("can contain only alphanumeric characters, underscore, dot, tilde, minus or slash")
+		return fmt.Errorf("can contain only alphanumeric characters, underscore, dot, tilde, minus, slash, colon")
 	}
 
 	return nil