Localize linktrail regex following wikimedia

src/wikitextprocessor/parser.py

@@ -924,11 +924,33 @@ def pop_until_nth_list(ctx: "Wtp", list_token: str) -> None:
         _parser_pop(ctx, True)
 
 
+# https://github.com/wikimedia/mediawiki/blob/0f67e1045f35a8c854f3c6a3e2712c2d8b0b54d6/languages/messages/MessagesEn.php#L571-L575
+LINKTRAIL_RE = re.compile(r"(?s)([a-z]+)(.*)")
+# https://github.com/wikimedia/mediawiki/blob/0f67e1045f35a8c854f3c6a3e2712c2d8b0b54d6/languages/messages/MessagesEl.php#L309
+LINKTRAIL_RE_EL = re.compile(
+    r"(?s)([a-zαβγδεζηθικλμνξοπρστυφχψωςΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩάέήίόύώϊϋΐΰΆΈΉΊΌΎΏΪΫ]+)(.*)"
+)
+LINKTRAIL_RE_RU = re.compile(
+    r"(?s)([a-zабвгдеёжзийклмнопрстуфхцчшщъыьэюя]+)(.*)"
+)
+
+
+def linktrail_re(lang: str) -> re.Pattern[str]:
+    match lang:
+        case "el":
+            return LINKTRAIL_RE_EL
+        case "ru":
+            return LINKTRAIL_RE_RU
+        case _:
+            return LINKTRAIL_RE
+
+
 def text_fn(ctx: "Wtp", token: str) -> None:
     """Inserts the token as raw text into the parse tree."""
     close_begline_lists(ctx)
 
     node = ctx.parser_stack[-1]
+    lang = ctx.lang_code
 
     # Convert certain characters from the token into HTML entities
     # XXX this breaks tags inside templates, e.g. <math> in
@@ -1029,7 +1051,7 @@ def text_fn(ctx: "Wtp", token: str) -> None:
         and not node.children[-1].children
         and not ctx.suppress_special
     ):
-        m = re.match(r"(?s)([a-z]+)(.*)", token)
+        m = linktrail_re(lang).match(token)
         if m:
             node.children[-1].children.append(m.group(1))
             token = m.group(2)