From 9704c3acd78ab5c561f4977a175dc72a1f31d1c7 Mon Sep 17 00:00:00 2001
From: Nitin Kumar <59679977+lazysegtree@users.noreply.github.com>
Date: Thu, 22 Jan 2026 18:08:37 +0530
Subject: [PATCH] fix: Fix custom option parsing in case of CXXOPTS_NO_REGEX

---
 include/cxxopts.hpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 6b9f0fd..1a50874 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -758,8 +758,16 @@ inline ArguDesc ParseArgument(const char *arg, bool &matched)
   {
     pdata += 1;
     if(isalnum(*pdata, std::locale::classic())) {
+      // If we have '=' right after first alnum, its a match.
+      if(*(pdata+1) == '=') {
+        argu_desc.arg_name.push_back(*pdata);
+        argu_desc.set_value = true;
+        argu_desc.value = std::string(pdata+2);
+      }
+      else{
+        argu_desc.arg_name = std::string(pdata);
+      }
       argu_desc.grouping = true;
-      argu_desc.arg_name = std::string(pdata);
       matched = true;
     }
   }