diff --git a/include/ctre/atoms_characters.hpp b/include/ctre/atoms_characters.hpp
index dbbee4cb..6a3b6451 100644
--- a/include/ctre/atoms_characters.hpp
+++ b/include/ctre/atoms_characters.hpp
@@ -39,75 +39,38 @@ template <typename... Content> struct set {
 	}
 };
 
+template <auto... Cs> struct enumeration : set<character<Cs>...> { };
+
 template <typename... Content> struct negate {
 	template <typename CharT> inline static constexpr bool match_char(CharT value) noexcept {
 		return !(Content::match_char(value) || ... || false);
 	}
 };
 
-struct word_chars {
+template <auto A, auto B> struct char_range {
 	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= 'A' && value <= 'Z') || (value >= 'a' && value <= 'z') || (value >= '0' && value <= '9') || (value == '_');
+		return (value >= A) && (value <= B);
 	}
 };
 
-struct space_chars {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return value == ' ' || value == '\t' || value == '\n' || value == '\v' || value == '\f' || value == '\r';
-	}
-};
+using word_chars = set<char_range<'A','Z'>, char_range<'a','z'>, char_range<'0','9'>, character<'_'>>;
 
-struct alphanum_chars {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= 'A' && value <= 'Z') || (value >= 'a' && value <= 'z') || (value >= '0' && value <= '9');
-	}
-};
+using space_chars = enumeration<' ', '\t', '\n', '\v', '\f', '\r'>;
 
-struct alpha_chars {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= 'A' && value <= 'Z') || (value >= 'a' && value <= 'z');
-	}
-};
+using alphanum_chars = set<char_range<'A','Z'>, char_range<'a','z'>, char_range<'0','9'> >;
 
-struct xdigit_chars {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= 'A' && value <= 'F') || (value >= 'a' && value <= 'f') || (value >= '0' && value <= '9');
-	}
-};
+using alpha_chars = set<char_range<'A','Z'>, char_range<'a','z'> >;
 
-struct punct_chars {
-	template <typename CharT> inline static constexpr bool match_char(CharT value) noexcept {
-		return value == '!' || value == '"' || value == '#' || value == '$' || value == '%'
-			|| value == '&' || value == '\''|| value == '(' || value == ')' || value == '*' || value == ','
-			|| value == '-' || value == '.' || value == '/' || value == ':' || value == ';'
-			|| value == '<' || value == '=' || value == '>' || value == '?' || value == '@' || value == '['
-			|| value == '\\'|| value == ']' || value == '^' || value == '_' || value == '`'
-			|| value == '{' || value == '|' || value == '}' || value == '~';
-	}
-};
+using xdigit_chars = set<char_range<'A','F'>, char_range<'a','f'>, char_range<'0','9'> >;
 
-struct digit_chars {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= '0' && value <= '9');
-	}
-};
+using punct_chars =
+    enumeration<'!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', ',', '-',
+		'.', '/', '=', ';', '<', '=', '>', '?', '@', '[', '\\', ']',
+		'^', '_', '`', '{', '|', '}', '~'>;
 
-struct ascii_chars {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= '\x00' && value <= '\x7F');
-	}
-};
+using digit_chars = char_range<'0','9'>;
 
-template <auto A, auto B> struct char_range {
-	template <typename CharT> CTRE_FORCE_INLINE static constexpr bool match_char(CharT value) noexcept {
-		return (value >= A) && (value <= B);
-	}
-};
-template <auto... Cs> struct enumeration {
-	template <typename CharT> inline static constexpr bool match_char(CharT value) noexcept {
-		return ((value == Cs) || ... || false);
-	}
-};
+using ascii_chars = char_range<'\x00','\x7F'>;
 
 }