diff --git a/js/util/validation.js b/js/util/validation.js
index 9f8f7a9..e2e07bc 100644
--- a/js/util/validation.js
+++ b/js/util/validation.js
@@ -64,6 +64,26 @@ export const isIn = function(valueC, message = "Value must be one of: %{1}") {
     return validation;
 };
 
+export const isUpper = function(message = "Value contains lower cased characters") {
+    const validation = (value, ctx) => {
+        if (value === null) return true;
+        if (value === "") return true;
+        if (value === value.toUpperCase()) return true;
+        throw new ValidationError(message);
+    };
+    return validation;
+};
+
+export const isLower = function(message = "Value contains upper cased characters") {
+    const validation = (value, ctx) => {
+        if (value === null) return true;
+        if (value === "") return true;
+        if (value === value.toLowerCase()) return true;
+        throw new ValidationError(message);
+    };
+    return validation;
+};
+
 export const isSimple = function(message = "Value contains invalid characters") {
     const validation = (value, ctx) => {
         if (value === null) return true;
@@ -103,3 +123,30 @@ export const isRegex = function(regex, message = "Value has incorrect format") {
     };
     return validation;
 };
+
+export const stringGt = function(valueC, message = "Must be larger than %{1} characters") {
+    const validation = (value, ctx) => {
+        if (value === null) return true;
+        if (value.length > valueC) return true;
+        throw new ValidationError(message.replace("%{1}", String(valueC)));
+    };
+    return validation;
+};
+
+export const stringLt = function(valueC, message = "Must be smaller than %{1} characters") {
+    const validation = (value, ctx) => {
+        if (value === null) return true;
+        if (value.length < valueC) return true;
+        throw new ValidationError(message.replace("%{1}", String(valueC)));
+    };
+    return validation;
+};
+
+export const stringEq = function(valueC, message = "Must be exactly %{1} characters") {
+    const validation = (value, ctx) => {
+        if (value === null) return true;
+        if (value.length === valueC) return true;
+        throw new ValidationError(message.replace("%{1}", String(valueC)));
+    };
+    return validation;
+};
diff --git a/test/util/validation.js b/test/util/validation.js
index 5169cfa..d18f64c 100644
--- a/test/util/validation.js
+++ b/test/util/validation.js
@@ -124,6 +124,54 @@ describe("#isIn()", function() {
     });
 });
 
+describe("#isUpper()", function() {
+    it("should verify basic is simple conditions", () => {
+        let result;
+
+        result = yonius.isUpper()("HELLO");
+        assert.strictEqual(result, true);
+
+        result = yonius.isUpper()("HELLO.WORLD");
+        assert.strictEqual(result, true);
+
+        result = yonius.isUpper()(null);
+        assert.strictEqual(result, true);
+
+        assert.throws(
+            () => yonius.isUpper()("illegal!"),
+            err => {
+                assert.strictEqual(err instanceof yonius.ValidationError, true);
+                assert.strictEqual(err.message, "Value contains lower cased characters");
+                return true;
+            }
+        );
+    });
+});
+
+describe("#isLower()", function() {
+    it("should verify basic is simple conditions", () => {
+        let result;
+
+        result = yonius.isLower()("hello");
+        assert.strictEqual(result, true);
+
+        result = yonius.isLower()("hello.hello");
+        assert.strictEqual(result, true);
+
+        result = yonius.isLower()(null);
+        assert.strictEqual(result, true);
+
+        assert.throws(
+            () => yonius.isLower()("ILLEGAL!"),
+            err => {
+                assert.strictEqual(err instanceof yonius.ValidationError, true);
+                assert.strictEqual(err.message, "Value contains upper cased characters");
+                return true;
+            }
+        );
+    });
+});
+
 describe("#isSimple()", function() {
     it("should verify basic is simple conditions", () => {
         let result;
@@ -213,3 +261,72 @@ describe("#isRegex()", function() {
         );
     });
 });
+
+describe("#stringGt()", function() {
+    it("should verify basic greater than operations", () => {
+        let result;
+
+        result = yonius.stringGt(2)("xxx");
+        assert.strictEqual(result, true);
+
+        result = yonius.stringGt(4)("xxxxx");
+        assert.strictEqual(result, true);
+
+        result = yonius.stringGt(4)(null);
+        assert.strictEqual(result, true);
+
+        assert.throws(
+            () => yonius.stringGt(4)("xxxx"),
+            err => {
+                assert.strictEqual(err instanceof yonius.ValidationError, true);
+                assert.strictEqual(err.message, "Must be larger than 4 characters");
+                return true;
+            }
+        );
+    });
+});
+
+describe("#stringLt()", function() {
+    it("should verify basic greater than operations", () => {
+        let result;
+
+        result = yonius.stringLt(2)("x");
+        assert.strictEqual(result, true);
+
+        result = yonius.stringLt(4)("xxx");
+        assert.strictEqual(result, true);
+
+        result = yonius.stringLt(4)(null);
+        assert.strictEqual(result, true);
+
+        assert.throws(
+            () => yonius.stringLt(4)("xxxx"),
+            err => {
+                assert.strictEqual(err instanceof yonius.ValidationError, true);
+                assert.strictEqual(err.message, "Must be smaller than 4 characters");
+                return true;
+            }
+        );
+    });
+});
+
+describe("#stringEq()", function() {
+    it("should verify basic greater than operations", () => {
+        let result;
+
+        result = yonius.stringEq(2)("xx");
+        assert.strictEqual(result, true);
+
+        result = yonius.stringEq(4)(null);
+        assert.strictEqual(result, true);
+
+        assert.throws(
+            () => yonius.stringEq(4)("xxx"),
+            err => {
+                assert.strictEqual(err instanceof yonius.ValidationError, true);
+                assert.strictEqual(err.message, "Must be exactly 4 characters");
+                return true;
+            }
+        );
+    });
+});