[text] add 'rextr()'

gallery_dl/text.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2015-2022 Mike Fährmann
+# Copyright 2015-2025 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -147,6 +147,15 @@ def rextract(txt, begin, end, pos=-1):
         return None, pos
 
 
+def rextr(txt, begin, end, pos=None, default=""):
+    """Stripped-down version of 'rextract()'"""
+    try:
+        first = txt.rindex(begin, None, pos) + len(begin)
+        return txt[first:txt.index(end, first)]
+    except Exception:
+        return default
+
+
 def extract_all(txt, rules, pos=0, values=None):
     """Calls extract for each rule and returns the result in a dict"""
     if values is None: