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Assets/TextMesh Pro/Examples & Extras/Scripts/TMP_DigitValidator.cs

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+using UnityEngine;
+using System;
+
+
+namespace TMPro
+{
+    /// <summary>
+    /// EXample of a Custom Character Input Validator to only allow digits from 0 to 9.
+    /// </summary>
+    [Serializable]
+    //[CreateAssetMenu(fileName = "InputValidator - Digits.asset", menuName = "TextMeshPro/Input Validators/Digits", order = 100)]
+    public class TMP_DigitValidator : TMP_InputValidator
+    {
+        // Custom text input validation function
+        public override char Validate(ref string text, ref int pos, char ch)
+        {
+            if (ch >= '0' && ch <= '9')
+            {
+                text += ch;
+                pos += 1;
+                return ch;
+            }
+
+            return (char)0;
+        }
+    }
+}