diff --git a/src/plugins/validation/2and3/semantic-validators/operation-ids.js b/src/plugins/validation/2and3/semantic-validators/operation-ids.js
index 9dc3b7509..976c42e34 100644
--- a/src/plugins/validation/2and3/semantic-validators/operation-ids.js
+++ b/src/plugins/validation/2and3/semantic-validators/operation-ids.js
@@ -112,7 +112,7 @@ module.exports.validate = function({ resolvedSpec }) {
         // If PATCH operation doesn't exist for path, POST operationId should start with "update"
         if (
           !allPathOperations.includes('patch') &&
-          !operationId.match(/^(update[a-zA-Z0-9_]+/m)
+          !operationId.match(/^update[a-zA-Z0-9_]+/m)
         ) {
           checkPassed = false;
           verbs.push('update');
diff --git a/src/plugins/validation/oas3/semantic-validators/openapi.js b/src/plugins/validation/oas3/semantic-validators/openapi.js
new file mode 100644
index 000000000..6ddb3bb09
--- /dev/null
+++ b/src/plugins/validation/oas3/semantic-validators/openapi.js
@@ -0,0 +1,41 @@
+// Assertation 1:
+// check if openapi field exist
+
+// Assertation 2:
+// make sure the field is of type string
+
+// Assertation 3:
+// make sure the string follows semantic versioning 2.0.0
+
+module.exports.validate = function({ jsSpec }) {
+  const errors = [];
+  const warnings = [];
+
+  // Regex taken from Semantic Versioning 2.0.0 documentation to check if string follows Semantic Versioning
+  // https://semver.org/
+  // Regex from: https://regex101.com/r/vkijKf/1/
+
+  const semverRegex = new RegExp(
+    /^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/gm
+  );
+
+  const openapi = jsSpec.openapi;
+
+  if (!openapi) {
+    errors.push({
+      path: ['openapi'],
+      message: 'API definition must have an `openapi` field'
+    });
+  } else if (typeof openapi !== 'string') {
+    errors.push({
+      path: ['openapi'],
+      message: 'API definition must have an `openapi` field as type string'
+    });
+  } else if (!openapi.match(semverRegex)) {
+    errors.push({
+      path: ['openapi'],
+      message: '`openapi` string must follow Semantic Versioning 2.0.0'
+    });
+  }
+  return { errors, warnings };
+};
diff --git a/src/plugins/validation/swagger2/semantic-validators/swagger.js b/src/plugins/validation/swagger2/semantic-validators/swagger.js
new file mode 100644
index 000000000..b9b176113
--- /dev/null
+++ b/src/plugins/validation/swagger2/semantic-validators/swagger.js
@@ -0,0 +1,33 @@
+// Assertation 1:
+// check if swagger field exist
+
+// Assertation 2:
+// make sure the swagger field is of type string
+
+// Assertation 3:
+// make sure the value of swagger field must be "2.0"
+
+module.exports.validate = function({ jsSpec }) {
+  const errors = [];
+  const warnings = [];
+
+  const swagger = jsSpec.swagger;
+
+  if (!swagger) {
+    errors.push({
+      path: ['swagger'],
+      message: 'API definition must have an `swagger` field'
+    });
+  } else if (typeof swagger !== 'string') {
+    errors.push({
+      path: ['swagger'],
+      message: 'API definition must have an `swagger` field as type string'
+    });
+  } else if (swagger !== '2.0') {
+    errors.push({
+      path: ['swagger'],
+      message: '`swagger` string must have the value `2.0`'
+    });
+  }
+  return { errors, warnings };
+};
diff --git a/test/plugins/validation/2and3/operation-ids.js b/test/plugins/validation/2and3/operation-ids.js
index 924f3f92a..0f5fda485 100644
--- a/test/plugins/validation/2and3/operation-ids.js
+++ b/test/plugins/validation/2and3/operation-ids.js
@@ -111,7 +111,7 @@ describe('validation plugin - semantic - operation-ids', function() {
         },
         '/coffee': {
           get: {
-            operationId: 'get books'
+            operationId: 'get_books'
           },
           post: {
             operationId: 'change_books'
@@ -158,9 +158,6 @@ describe('validation plugin - semantic - operation-ids', function() {
           },
           put: {
             operationId: 'changeCoffee2'
-          },
-          patch: {
-            operationId: 'changeCoffee3'
           }
         }
       }
diff --git a/test/plugins/validation/oas3/openapi.js b/test/plugins/validation/oas3/openapi.js
new file mode 100644
index 000000000..02c40cda8
--- /dev/null
+++ b/test/plugins/validation/oas3/openapi.js
@@ -0,0 +1,46 @@
+const expect = require('expect');
+const {
+  validate
+} = require('../../../../src/plugins/validation/oas3/semantic-validators/openapi');
+
+describe('validation plugin - semantic - openapi', () => {
+  //this is for openapi object
+  it('should return an error when an API definition does not have openapi field', () => {
+    const spec = {
+      Openapi: '3.0.0'
+    };
+
+    const res = validate({ jsSpec: spec });
+    expect(res.errors.length).toEqual(1);
+    expect(res.errors[0].path).toEqual(['openapi']);
+    expect(res.errors[0].message).toEqual(
+      'API definition must have an `openapi` field'
+    );
+  });
+
+  it('should return an error when an openapi field is not a string', () => {
+    const spec = {
+      openapi: 123
+    };
+
+    const res = validate({ jsSpec: spec });
+    expect(res.errors.length).toEqual(1);
+    expect(res.errors[0].path).toEqual(['openapi']);
+    expect(res.errors[0].message).toEqual(
+      'API definition must have an `openapi` field as type string'
+    );
+  });
+
+  it('should return an error when an openapi does not conform to semantic versioning 2.0.0', () => {
+    const spec = {
+      openapi: 'v1.0.10'
+    };
+
+    const res = validate({ jsSpec: spec });
+    expect(res.errors.length).toEqual(1);
+    expect(res.errors[0].path).toEqual(['openapi']);
+    expect(res.errors[0].message).toEqual(
+      '`openapi` string must follow Semantic Versioning 2.0.0'
+    );
+  });
+});
diff --git a/test/plugins/validation/swagger2/swagger.js b/test/plugins/validation/swagger2/swagger.js
new file mode 100644
index 000000000..5f06cc742
--- /dev/null
+++ b/test/plugins/validation/swagger2/swagger.js
@@ -0,0 +1,46 @@
+const expect = require('expect');
+const {
+  validate
+} = require('../../../../src/plugins/validation/swagger2/semantic-validators/swagger');
+
+describe('validation plugin - semantic - swagger', () => {
+  //this is for openapi object
+  it('should return an error when an API definition does not have swagger field', () => {
+    const spec = {
+      Swagger: '2.0'
+    };
+
+    const res = validate({ jsSpec: spec });
+    expect(res.errors.length).toEqual(1);
+    expect(res.errors[0].path).toEqual(['swagger']);
+    expect(res.errors[0].message).toEqual(
+      'API definition must have an `swagger` field'
+    );
+  });
+
+  it('should return an error when an swagger field is not a string', () => {
+    const spec = {
+      swagger: 123
+    };
+
+    const res = validate({ jsSpec: spec });
+    expect(res.errors.length).toEqual(1);
+    expect(res.errors[0].path).toEqual(['swagger']);
+    expect(res.errors[0].message).toEqual(
+      'API definition must have an `swagger` field as type string'
+    );
+  });
+
+  it('should return an error when an swagger field does not have value `2.0`', () => {
+    const spec = {
+      swagger: '2.0.0'
+    };
+
+    const res = validate({ jsSpec: spec });
+    expect(res.errors.length).toEqual(1);
+    expect(res.errors[0].path).toEqual(['swagger']);
+    expect(res.errors[0].message).toEqual(
+      '`swagger` string must have the value `2.0`'
+    );
+  });
+});