diff --git a/sprout/weed/detail/c_str_as_string.hpp b/sprout/weed/detail/c_str_as_string.hpp
index fffe3725..dd0cb62a 100644
--- a/sprout/weed/detail/c_str_as_string.hpp
+++ b/sprout/weed/detail/c_str_as_string.hpp
@@ -5,12 +5,15 @@
 #include <sprout/config.hpp>
 #include <sprout/string.hpp>
 #include <sprout/type_traits/identity.hpp>
+#include <sprout/type/void.hpp>
 
 namespace sprout {
 	namespace weed {
 		namespace detail {
 			template<typename T>
-			struct c_str_as_string;
+			struct c_str_as_string
+				: public sprout::identity<sprout::types::void_>
+			{};
 			template<typename T>
 			struct c_str_as_string<T const>
 				: public sprout::weed::detail::c_str_as_string<T>
diff --git a/sprout/weed/detail/find_character_set.hpp b/sprout/weed/detail/find_character_set.hpp
new file mode 100644
index 00000000..a5b7e7a8
--- /dev/null
+++ b/sprout/weed/detail/find_character_set.hpp
@@ -0,0 +1,112 @@
+#ifndef SPROUT_WEED_DETAIL_FIND_CHARACTER_SET_HPP
+#define SPROUT_WEED_DETAIL_FIND_CHARACTER_SET_HPP
+
+#include <iterator>
+#include <type_traits>
+#include <sprout/config.hpp>
+#include <sprout/iterator/operation.hpp>
+#include <sprout/iterator/type_traits/category.hpp>
+#include <sprout/utility/pair/pair.hpp>
+
+namespace sprout {
+	namespace weed {
+		namespace detail {
+			template<typename RandomAccessIterator, typename T>
+			inline SPROUT_CONSTEXPR RandomAccessIterator
+			find_character_set_impl_ra(
+				RandomAccessIterator first, RandomAccessIterator last, T const& value,
+				typename std::iterator_traits<RandomAccessIterator>::difference_type pivot, RandomAccessIterator found
+				)
+			{
+				return found != first ? found
+					: pivot == 0 ? (
+						*first == T('-') ? *sprout::prev(first) <= value && *sprout::next(first) >= value
+							: *first == value
+						) ? first : last
+					: sprout::weed::detail::find_character_set_impl_ra(
+						sprout::next(first, pivot), last, value,
+						(sprout::distance(first, last) - pivot) / 2,
+						sprout::weed::detail::find_character_set_impl_ra(
+							first, sprout::next(first, pivot), value,
+							pivot / 2,
+							first
+							)
+						)
+					;
+			}
+			template<typename RandomAccessIterator, typename T>
+			inline SPROUT_CONSTEXPR typename std::enable_if<
+				sprout::is_constant_distance_iterator<RandomAccessIterator>::value,
+				RandomAccessIterator
+			>::type
+			find_character_set(
+				RandomAccessIterator first, RandomAccessIterator last, T const& value,
+				std::random_access_iterator_tag*
+				)
+			{
+				return first == last ? last
+					: sprout::weed::detail::find_character_set_impl_ra(first, last, value, sprout::distance(first, last) / 2, first)
+					;
+			}
+
+			template<typename BidirectionalIterator, typename T>
+			inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator, bool>
+			find_character_set_impl_1(
+				sprout::pair<BidirectionalIterator, bool> const& current,
+				BidirectionalIterator last, T const& value, typename std::iterator_traits<BidirectionalIterator>::difference_type n
+				)
+			{
+				typedef sprout::pair<BidirectionalIterator, bool> type;
+				return current.second || current.first == last ? current
+					: n == 1 ? (
+						*current.first == T('-') ? *sprout::prev(current.first) <= value && *sprout::next(current.first) >= value
+							: *current.first == value
+						) ? type(current.first, true) : type(sprout::next(current.first), false)
+					: sprout::weed::detail::find_character_set_impl_1(
+						sprout::weed::detail::find_character_set_impl_1(
+							current,
+							last, value, n / 2
+							),
+						last, value, n - n / 2
+						)
+					;
+			}
+			template<typename BidirectionalIterator, typename T>
+			inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator, bool>
+			find_character_set_impl(
+				sprout::pair<BidirectionalIterator, bool> const& current,
+				BidirectionalIterator last, T const& value, typename std::iterator_traits<BidirectionalIterator>::difference_type n
+				)
+			{
+				return current.second || current.first == last ? current
+					: sprout::weed::detail::find_character_set_impl(
+						sprout::weed::detail::find_character_set_impl_1(
+							current,
+							last, value, n
+							),
+						last, value, n * 2
+						)
+					;
+			}
+			template<typename BidirectionalIterator, typename T>
+			inline SPROUT_CONSTEXPR BidirectionalIterator
+			find_character_set(
+				BidirectionalIterator first, BidirectionalIterator last, T const& value,
+				std::input_iterator_tag*
+				)
+			{
+				typedef sprout::pair<BidirectionalIterator, bool> type;
+				return sprout::weed::detail::find_character_set_impl(type(first, false), last, value, 1).first;
+			}
+
+			template<typename BidirectionalIterator, typename T>
+			inline SPROUT_CONSTEXPR BidirectionalIterator
+			find_character_set(BidirectionalIterator first, BidirectionalIterator last, T const& value) {
+				typedef typename std::iterator_traits<BidirectionalIterator>::iterator_category* category;
+				return sprout::weed::detail::find_character_set(first, last, value, category());
+			}
+		}	// namespace detail
+	}	// namespace weed
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_WEED_DETAIL_FIND_CHARACTER_SET_HPP
diff --git a/sprout/weed/parser/char/char.hpp b/sprout/weed/parser/char/char.hpp
index e1e9bf42..2c55a4de 100644
--- a/sprout/weed/parser/char/char.hpp
+++ b/sprout/weed/parser/char/char.hpp
@@ -4,6 +4,9 @@
 #include <iterator>
 #include <type_traits>
 #include <sprout/config.hpp>
+#include <sprout/string.hpp>
+#include <sprout/container/begin.hpp>
+#include <sprout/container/end.hpp>
 #include <sprout/iterator/next.hpp>
 #include <sprout/type_traits/identity.hpp>
 #include <sprout/weed/unused.hpp>
@@ -11,6 +14,10 @@
 #include <sprout/weed/parser/parser_base.hpp>
 #include <sprout/weed/parser/lit.hpp>
 #include <sprout/weed/traits/type/is_char_type.hpp>
+#include <sprout/weed/traits/type/is_c_str.hpp>
+#include <sprout/weed/traits/type/is_string.hpp>
+#include <sprout/weed/detail/find_character_set.hpp>
+#include <sprout/weed/detail/c_str_as_string.hpp>
 
 namespace sprout {
 	namespace weed {
@@ -152,6 +159,45 @@ namespace sprout {
 			}
 		};
 
+		//
+		// char_set_p
+		//
+		template<typename T>
+		struct char_set_p
+			: public sprout::weed::parser_base
+		{
+		public:
+			template<typename Context, typename Iterator>
+			struct attribute
+				: public sprout::identity<typename std::iterator_traits<Iterator>::value_type>
+			{};
+			template<typename Context, typename Iterator>
+			struct result
+				: public sprout::identity<sprout::weed::parser_result<Iterator, typename attribute<Context, Iterator>::type> >
+			{};
+		private:
+			T t_;
+		public:
+			char_set_p() = default;
+			explicit SPROUT_CONSTEXPR char_set_p(T const& t)
+				: t_(t)
+			{}
+			template<typename Context, typename Iterator>
+			SPROUT_CONSTEXPR typename result<Context, Iterator>::type operator()(
+				Iterator first,
+				Iterator last,
+				Context const&
+				) const
+			{
+				typedef typename result<Context, Iterator>::type result_type;
+				typedef typename attribute<Context, Iterator>::type attribute_type;
+				return first != last && sprout::weed::detail::find_character_set(sprout::begin(t_), sprout::end(t_), *first) != sprout::end(t_)
+					? result_type(true, sprout::next(first), *first)
+					: result_type(false, first, attribute_type())
+					;
+			}
+		};
+
 		//
 		// any_char_p
 		//
@@ -198,6 +244,26 @@ namespace sprout {
 			operator()(T const& f, T const& l) const {
 				return sprout::weed::char_range_p<T>(f, l);
 			}
+			template<typename T>
+			SPROUT_CONSTEXPR typename std::enable_if<
+				sprout::weed::traits::is_c_str<T const>::value,
+				sprout::weed::char_set_p<
+					typename sprout::weed::detail::c_str_as_string<T const>::type
+				>
+			>::type
+			operator()(T const& t) const {
+				return sprout::weed::char_set_p<
+					typename sprout::weed::detail::c_str_as_string<T const>::type
+					>(sprout::to_string(t));
+			}
+			template<typename T>
+			SPROUT_CONSTEXPR typename std::enable_if<
+				sprout::weed::traits::is_string<T>::value,
+				sprout::weed::char_set_p<T>
+			>::type
+			operator()(T const& t) const {
+				return sprout::weed::char_set_p<T>(t);
+			}
 		};
 		//
 		// char_
diff --git a/sprout/weed/parser/string/string.hpp b/sprout/weed/parser/string/string.hpp
index faf20225..d13063c6 100644
--- a/sprout/weed/parser/string/string.hpp
+++ b/sprout/weed/parser/string/string.hpp
@@ -16,6 +16,7 @@
 #include <sprout/weed/parser/lit.hpp>
 #include <sprout/weed/traits/type/is_c_str.hpp>
 #include <sprout/weed/traits/type/is_string.hpp>
+#include <sprout/weed/detail/c_str_as_string.hpp>
 
 namespace sprout {
 	namespace weed {