diff --git a/libse/CharUtils.cs b/libse/CharUtils.cs
new file mode 100644
index 000000000..40adb6715
--- /dev/null
+++ b/libse/CharUtils.cs
@@ -0,0 +1,15 @@
+namespace Nikse.SubtitleEdit.Core
+{
+    public static class CharUtils
+    {
+        /// <summary>
+        /// Checks if character matches [0-9]
+        /// </summary>
+        /// <param name="ch"></param>
+        /// <returns></returns>
+        public static bool IsDigit(char ch)
+        {
+            return (ch >= '0') && (ch <= '9');
+        }
+    }
+}