diff --git a/engine/query/utils/addDbEntry.js b/engine/query/utils/addDbEntry.js
index 6feefc3..4add668 100644
--- a/engine/query/utils/addDbEntry.js
+++ b/engine/query/utils/addDbEntry.js
@@ -89,6 +89,22 @@ async function addDbEntry({ dbFullName, tableName, data, tableSchema, duplicateC
                 console.log("DSQL: Encrypted value =>", value);
             }
 
+            if (targetFieldSchema?.pattern) {
+                const pattern = new RegExp(targetFieldSchema.pattern, targetFieldSchema.patternFlags || "");
+                if (!pattern.test(value)) {
+                    console.log("DSQL: Pattern not matched =>", value);
+                    value = "";
+                }
+            }
+
+            if (typeof value === "string" && !value.match(/./i)) {
+                value = {
+                    toSqlString: function () {
+                        return "NULL";
+                    },
+                };
+            }
+
             insertKeysArray.push("`" + dataKey + "`");
 
             if (typeof value === "object") {
diff --git a/engine/query/utils/updateDbEntry.js b/engine/query/utils/updateDbEntry.js
index 74eca6d..2531b5b 100644
--- a/engine/query/utils/updateDbEntry.js
+++ b/engine/query/utils/updateDbEntry.js
@@ -81,6 +81,14 @@ async function updateDbEntry({ dbContext, paradigm, dbFullName, tableName, data,
                 };
             }
 
+            if (targetFieldSchema?.pattern) {
+                const pattern = new RegExp(targetFieldSchema.pattern, targetFieldSchema.patternFlags || "");
+                if (!pattern.test(value)) {
+                    console.log("DSQL: Pattern not matched =>", value);
+                    value = "";
+                }
+            }
+
             if (typeof value === "string" && !value.match(/./i)) {
                 value = {
                     toSqlString: function () {
diff --git a/package.json b/package.json
index eb00c03..b6b1ca8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "datasquirel",
-    "version": "1.8.8",
+    "version": "1.8.9",
     "description": "Cloud-based SQL data management tool",
     "main": "index.js",
     "bin": {
diff --git a/types/database-schema.td.js b/types/database-schema.td.js
index b4ceb9f..bf4a285 100644
--- a/types/database-schema.td.js
+++ b/types/database-schema.td.js
@@ -60,6 +60,8 @@
  * @property {string} [defaultValueLiteral] - SQL key word which generates value automatically => "CURRENT_TIMESTAMP"
  * @property {DSQL_ForeignKeyType} [foreignKey] - Field foreign key reference object
  * @property {boolean} [richText] - Rich text field
+ * @property {string | RegExp} [pattern] - Field pattern for validation. Can be a string or a regular expression. Example: "^[a-zA-Z0-9_]*$"
+ * @property {string} [patternFlags] - Field pattern flags for validation. Example: "i"
  */
 
 /**