diff --git a/src/app/utils/reg-exp.spec.ts b/src/app/utils/reg-exp.spec.ts
new file mode 100644
index 000000000..2ae5e4700
--- /dev/null
+++ b/src/app/utils/reg-exp.spec.ts
@@ -0,0 +1,121 @@
+import {
+	followersRegExp,
+	fromRegExp,
+	nearRegExp,
+	sinceRegExp,
+	untilRegExp,
+	filterRegExp
+} from './reg-exp';
+
+describe('reg-exp', () => {
+	// Test expression of the form fromRegExp
+	it('should return true when input is (from:fossasia)', () => {
+		const str = 'from:fossasia';
+		const match: RegExpExecArray = fromRegExp.exec(str);
+		expect(match[0]).toEqual('from:fossasia');
+		expect(match[1]).toEqual('fossasia');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form fromRegExp
+	it('should return false when input is (fossasia)', () => {
+		const str = 'fossasia';
+		const match: RegExpExecArray = fromRegExp.exec(str);
+		expect(match).toBeNull();
+		expect(match).toBeFalsy();
+	});
+
+	// Test expression of the form followersRegExp
+	it('should return true when input is (followers:fossasia)', () => {
+		const str = 'followers:fossasia';
+		const match: RegExpExecArray = followersRegExp.exec(str);
+		expect(match[0]).toEqual('followers:fossasia');
+		expect(match[1]).toEqual('fossasia');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form followersRegExp
+	it('should return false when input is (near:fossasia)', () => {
+		const str = 'near:fossasia';
+		const match: RegExpExecArray = followersRegExp.exec(str);
+		expect(match).toBeNull();
+		expect(match).toBeFalsy();
+	});
+
+	// Test expression of the form nearRegExp
+	it('should return true when input is (near:Delhi)', () => {
+		const str = 'near:Delhi';
+		const match: RegExpExecArray = nearRegExp.exec(str);
+		expect(match[0]).toEqual('near:Delhi');
+		expect(match[1]).toEqual('Delhi');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form nearRegExp
+	it('should return false when input is (from:Delhi)', () => {
+		const str = 'from:Delhi';
+		const match: RegExpExecArray = nearRegExp.exec(str);
+		expect(match).toBeNull();
+		expect(match).toBeFalsy();
+	});
+
+	// Test expression of the form sinceRegExp
+	it('should return true when input is (since:19:06:2018)', () => {
+		const str = 'since:19:06:2018';
+		const match: RegExpExecArray = sinceRegExp.exec(str);
+		expect(match[0]).toEqual('since:19:06:2018');
+		expect(match[1]).toEqual('19:06:2018');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form sinceRegExp
+	it('should return false when input is (from:19:06:2018)', () => {
+		const str = 'from:19:06:2018';
+		const match: RegExpExecArray = sinceRegExp.exec(str);
+		expect(match).toBeNull();
+		expect(match).toBeFalsy();
+	});
+
+	// Test expression of the form untilRegExp
+	it('should return true when input is (until:19:06:2018)', () => {
+		const str = 'until:19:06:2018';
+		const match: RegExpExecArray = untilRegExp.exec(str);
+		expect(match[0]).toEqual('until:19:06:2018');
+		expect(match[1]).toEqual('19:06:2018');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form untilRegExp
+	it('should return false when input is (near:19:06:2018)', () => {
+		const str = 'near:19:06:2018';
+		const match: RegExpExecArray = untilRegExp.exec(str);
+		expect(match).toBeNull();
+		expect(match).toBeFalsy();
+	});
+
+	// Test expression of the form filterRegExp
+	it('should return true when input is (filter:image)', () => {
+		const str = 'filter:image';
+		const match: RegExpExecArray = filterRegExp.exec(str);
+		expect(match[0]).toEqual('filter:image');
+		expect(match[1]).toEqual('image');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form filterRegExp
+	it('should return true when input is (filter:video)', () => {
+		const str = 'filter:video';
+		const match: RegExpExecArray = filterRegExp.exec(str);
+		expect(match[0]).toEqual('filter:video');
+		expect(match[1]).toEqual('video');
+		expect(match).toBeTruthy();
+	});
+
+	// Test expression of the form filterRegExp
+	it('should return false when input is (image:filter)', () => {
+		const str = 'image:filter';
+		const match: RegExpExecArray = filterRegExp.exec(str);
+		expect(match).toBeNull();
+		expect(match).toBeFalsy();
+	});
+});