From d7641fbb2f61d74ef0e877a968a0205cfc52841b Mon Sep 17 00:00:00 2001
From: MichaelDvP <github@mdvp.de>
Date: Fri, 10 Jul 2026 08:16:58 +0200
Subject: [PATCH] use regex for isnum

---
 src/core/shuntingYard.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/core/shuntingYard.cpp b/src/core/shuntingYard.cpp
index fd51bbf5e..8d7755a72 100644
--- a/src/core/shuntingYard.cpp
+++ b/src/core/shuntingYard.cpp
@@ -21,6 +21,7 @@
 #include "emsesp.h"
 
 #include "shuntingYard.h"
+#include <regex>
 
 namespace emsesp {
 
@@ -333,6 +334,9 @@ std::deque<Token> shuntingYard(const std::deque<Token> & tokens) {
 
 // check if string is a number
 bool isnum(const std::string & s) {
+    std::regex r("^[+-]?(\\d+\\.?\\d*)$");
+    return std::regex_match(s, r);
+    /*
     if (s.empty() || s.find_first_of("0123456789") == std::string::npos) {
         return false;
     }
@@ -340,6 +344,7 @@ bool isnum(const std::string & s) {
         return true;
     }
     return false;
+    */
 }