From bbafda6e8629d8513697021aa1d06e786084af54 Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <doxygen@gmail.com>
Date: Thu, 8 Apr 2021 21:32:31 +0200
Subject: regex: Avoid wrong assumption that char is always signed.

---
 src/regex.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/regex.cpp b/src/regex.cpp
index ae5476e..2a39f63 100644
--- a/src/regex.cpp
+++ b/src/regex.cpp
@@ -37,7 +37,7 @@ static inline bool isspace(char c)
 
 static inline bool isalpha(char c)
 {
-  return c<0 || (c>='a' && c<='z') || (c>='A' && c<='Z');
+  return static_cast<unsigned char>(c)>=128 || (c>='a' && c<='z') || (c>='A' && c<='Z');
 }
 
 static inline bool isdigit(char c)
-- 
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