From ba742aa24f621aef56fc7bdeefbdcc0f773eb89f Mon Sep 17 00:00:00 2001
From: Brian MacIntosh <brianamacintosh@gmail.com>
Date: Thu, 23 Feb 2023 09:15:00 -0800
Subject: [PATCH] Variable declarator 'let' will only be matched as a
 standalone word. Fixes custom functions containing 'let' not being parsed
 correctly.

---
 MathParser/MathParser.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/MathParser/MathParser.cs b/MathParser/MathParser.cs
index d0f7f57..e849f8c 100644
--- a/MathParser/MathParser.cs
+++ b/MathParser/MathParser.cs
@@ -305,7 +305,7 @@ public double ProgrammaticallyParse(string mathExpression, bool correctExpressio
             string varName;
             double varValue;
 
-            if (mathExpression.Contains(VariableDeclarator))
+            if (System.Text.RegularExpressions.Regex.IsMatch(mathExpression, @"\b" + VariableDeclarator + @"\b"))
             {
                 if (mathExpression.Contains("be"))
                 {