diff --git a/docs/UsingMatchers.md b/docs/UsingMatchers.md
index 8b375525e126..c642b54f1461 100644
--- a/docs/UsingMatchers.md
+++ b/docs/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```
 
diff --git a/website/versioned_docs/version-25.x/UsingMatchers.md b/website/versioned_docs/version-25.x/UsingMatchers.md
index 51634dfaf842..06db29575bf2 100644
--- a/website/versioned_docs/version-25.x/UsingMatchers.md
+++ b/website/versioned_docs/version-25.x/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```
 
diff --git a/website/versioned_docs/version-26.x/UsingMatchers.md b/website/versioned_docs/version-26.x/UsingMatchers.md
index fd9347ae99ca..8ee81fa06f82 100644
--- a/website/versioned_docs/version-26.x/UsingMatchers.md
+++ b/website/versioned_docs/version-26.x/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```
 
diff --git a/website/versioned_docs/version-27.x/UsingMatchers.md b/website/versioned_docs/version-27.x/UsingMatchers.md
index 8b375525e126..c642b54f1461 100644
--- a/website/versioned_docs/version-27.x/UsingMatchers.md
+++ b/website/versioned_docs/version-27.x/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```
 
diff --git a/website/versioned_docs/version-28.x/UsingMatchers.md b/website/versioned_docs/version-28.x/UsingMatchers.md
index 8b375525e126..c642b54f1461 100644
--- a/website/versioned_docs/version-28.x/UsingMatchers.md
+++ b/website/versioned_docs/version-28.x/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```
 
diff --git a/website/versioned_docs/version-29.0/UsingMatchers.md b/website/versioned_docs/version-29.0/UsingMatchers.md
index 8b375525e126..c642b54f1461 100644
--- a/website/versioned_docs/version-29.0/UsingMatchers.md
+++ b/website/versioned_docs/version-29.0/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```
 
diff --git a/website/versioned_docs/version-29.1/UsingMatchers.md b/website/versioned_docs/version-29.1/UsingMatchers.md
index 8b375525e126..c642b54f1461 100644
--- a/website/versioned_docs/version-29.1/UsingMatchers.md
+++ b/website/versioned_docs/version-29.1/UsingMatchers.md
@@ -142,16 +142,20 @@ If you want to test whether a particular function throws an error when it's call
 
 ```js
 function compileAndroidCode() {
-  throw new Error('you are using the wrong JDK');
+  throw new Error('you are using the wrong JDK!');
 }
 
 test('compiling android goes as expected', () => {
   expect(() => compileAndroidCode()).toThrow();
   expect(() => compileAndroidCode()).toThrow(Error);
 
-  // You can also use the exact error message or a regexp
+  // You can also use a string that must be contained in the error message or a regexp
   expect(() => compileAndroidCode()).toThrow('you are using the wrong JDK');
   expect(() => compileAndroidCode()).toThrow(/JDK/);
+
+  // Or you can match an exact error mesage using a regexp like below
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK$/); // Test fails
+  expect(() => compileAndroidCode()).toThrow(/^you are using the wrong JDK!$/); // Test pass
 });
 ```