commit 0ec9e99ff47795257df250c97adfa9b356502ce2
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Sat Jul 17 21:25:48 2021 -0500

    also escape special characters at the end of a string

diff --git a/apertium/transfer_regex.cc b/apertium/transfer_regex.cc
index 642caad..6698254 100644
--- a/apertium/transfer_regex.cc
+++ b/apertium/transfer_regex.cc
@@ -52,6 +52,9 @@ unbuildTrie(TrieNode* root)
   int single_count = 0;
   for (auto it : root->next) {
     if (it->end && it->next.empty()) {
+      if (it->c == '+' || it->c == '*' || it->c == '?' || it->c == '.') {
+        single += '\\';
+      }
       single += it->c;
       single_count++;
     } else {