diff --git a/libs/gfx/source/effect/blur.cpp b/libs/gfx/source/effect/blur.cpp
index 4ded46d1..8c1fb490 100644
--- a/libs/gfx/source/effect/blur.cpp
+++ b/libs/gfx/source/effect/blur.cpp
@@ -3,6 +3,7 @@
 #include <psemek/gfx/array.hpp>
 #include <psemek/gfx/gl.hpp>
 
+#include <psemek/util/string.hpp>
 #include <psemek/util/to_string.hpp>
 
 #include <iomanip>
@@ -67,17 +68,6 @@ void main()
 }
 )";
 
-	static void replace_all(std::string & str, std::string_view old_str, std::string_view new_str)
-	{
-		for (size_t i = 0;;)
-		{
-			i = str.find(old_str, i);
-			if (i == std::string::npos) break;
-			str.replace(i, old_str.size(), new_str);
-			i += new_str.size();
-		}
-	}
-
 	static std::string generate_blur_fs_source(int size, float sigma, bool horizontal)
 	{
 		std::string size_str = util::to_string(size);
@@ -105,9 +95,9 @@ void main()
 		}
 
 		std::string result = blur_fs_template;
-		replace_all(result, "@BLUR_SIZE@", size_str);
-		replace_all(result, "@BLUR_COEFFS@", coeffs_ss.str());
-		replace_all(result, "@BLUR_DIRECTION@", direction_str);
+		result = util::replace_all(std::move(result), "@BLUR_SIZE@", size_str);
+		result = util::replace_all(std::move(result), "@BLUR_COEFFS@", coeffs_ss.str());
+		result = util::replace_all(std::move(result), "@BLUR_DIRECTION@", direction_str);
 		return result;
 	}
 
diff --git a/libs/util/include/psemek/util/string.hpp b/libs/util/include/psemek/util/string.hpp
new file mode 100644
index 00000000..a405086d
--- /dev/null
+++ b/libs/util/include/psemek/util/string.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <string>
+#include <string_view>
+
+namespace psemek::util
+{
+
+	std::string replace_all(std::string str, std::string_view old_str, std::string_view new_str);
+
+	std::string trim_front(std::string str);
+	std::string trim_back(std::string str);
+	std::string trim(std::string str);
+
+}
diff --git a/libs/util/source/string.cpp b/libs/util/source/string.cpp
new file mode 100644
index 00000000..456c31bd
--- /dev/null
+++ b/libs/util/source/string.cpp
@@ -0,0 +1,42 @@
+#include <psemek/util/string.hpp>
+
+namespace psemek::util
+{
+
+	std::string replace_all(std::string str, std::string_view old_str, std::string_view new_str)
+	{
+		for (size_t i = 0;;)
+		{
+			i = str.find(old_str, i);
+			if (i == std::string::npos) break;
+			str.replace(i, old_str.size(), new_str);
+			i += new_str.size();
+		}
+		return str;
+	}
+
+	static std::string const whitespace_mask = " \t\n\r\f\v";
+
+	std::string trim_front(std::string str)
+	{
+		str.erase(0, str.find_first_not_of(whitespace_mask));
+		return str;
+	}
+
+	std::string trim_back(std::string str)
+	{
+		size_t pos = str.find_last_not_of(whitespace_mask);
+		if (pos != std::string::npos) {
+			str.erase(pos + 1);
+		} else {
+			str.clear();
+		}
+		return str;
+	}
+
+	std::string trim(std::string str)
+	{
+		return trim_back(trim_front(std::move(str)));
+	}
+
+}