commit 798c4a4d89ff7647e408ff93011d1f9ec79db949
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Fri Jul 2 12:14:51 2021 -0500

    delete RegexMatchers when we're done with them (memory leak)

diff --git a/apertium/apertium_re.cc b/apertium/apertium_re.cc
index 01599b3..c128abf 100644
--- a/apertium/apertium_re.cc
+++ b/apertium/apertium_re.cc
@@ -87,6 +87,7 @@ ApertiumRE::match(UString const &str) const
   }
 
   if (!m->find()) {
+    delete m;
     return ""_u;
   }
 
@@ -97,6 +98,8 @@ ApertiumRE::match(UString const &str) const
     exit(EXIT_FAILURE);
   }
 
+  delete m;
+
   return ret;
 }
 
@@ -121,11 +124,13 @@ ApertiumRE::replace(UString &str, UString const &value) const
   // do this manually rather than call m->replaceFirst()
   // because we want to know that a match happened
   if (!m->find()) {
+    delete m;
     return false;
   }
   UString res = str.substr(0, m->start(err));
   res.append(value);
   res.append(str.substr(m->end(err)));
   res.swap(str);
+  delete m;
   return true;
 }