commit 8d1b6207c5b03a969362a558c3b5451d036f09e8
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Mon Jun 14 10:33:59 2021 -0500

    add caseless compare helper to replace (tolower(a) == tolower(b))

diff --git a/lttoolbox/string_utils.cc b/lttoolbox/string_utils.cc
index fe2d2bc..411380d 100644
--- a/lttoolbox/string_utils.cc
+++ b/lttoolbox/string_utils.cc
@@ -233,3 +233,17 @@ StringUtils::copycase(const UString& source, const UString& target)
     return tolower(target);
   }
 }
+
+bool
+StringUtils::caseequal(const UString& a, const UString& b)
+{
+  UErrorCode err = U_ZERO_ERROR;
+  int cmp = u_strCaseCompare(a.c_str(), -1, b.c_str(), -1, 0, &err);
+  if (U_FAILURE(err)) {
+    std::cerr << "Error: caseless string comparison failed on '";
+    std::cerr << a << "' and '" << b << "'" << std::endl;
+    std::cerr << "error code: " << u_errorName(err) << std::endl;
+    exit(EXIT_FAILURE);
+  }
+  return (cmp == 0);
+}
diff --git a/lttoolbox/string_utils.h b/lttoolbox/string_utils.h
index df664ab..79aeadf 100644
--- a/lttoolbox/string_utils.h
+++ b/lttoolbox/string_utils.h
@@ -31,6 +31,8 @@ public:
 
   static UString getcase(const UString& str);
   static UString copycase(const UString& source, const UString& target);
+
+  static bool caseequal(const UString& a, const UString& b);
 };
 
 #endif // __LT_STRING_UTILS_H__