diff --git a/__tests__/ExpensiMark-HTML-test.js b/__tests__/ExpensiMark-HTML-test.js
index 433a13bc..f789fb8e 100644
--- a/__tests__/ExpensiMark-HTML-test.js
+++ b/__tests__/ExpensiMark-HTML-test.js
@@ -1312,6 +1312,52 @@ test('Test for @here mention without space or supported styling character', () =
     expect(parser.replace(testString)).toBe(resultString);
 });
 
+test('Test user mention and here mention, which are concatenated without space', () => {
+    let testString = '@test.example+2@gmail.com@here';
+    let resultString = '<mention-user>@test.example+2@gmail.com</mention-user><mention-here>@here</mention-here>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here@test.example+2@gmail.com';
+    resultString = '<mention-here>@here</mention-here><mention-user>@test.example+2@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@test.example+2@gmail.com@test.example+2@gmail.com';
+    resultString = '<mention-user>@test.example+2@gmail.com</mention-user><mention-user>@test.example+2@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here@here@gmail.com';
+    resultString = '<mention-here>@here</mention-here><mention-user>@here@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here@gmail.com@here';
+    resultString = '<mention-user>@here@gmail.com</mention-user><mention-here>@here</mention-here>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here@here+1@gmail.com';
+    resultString = '<mention-here>@here</mention-here><mention-user>@here+1@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here+1@gmail.com@here';
+    resultString = '<mention-user>@here+1@gmail.com</mention-user><mention-here>@here</mention-here>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here@gmail.com@here@here@gmail.com';
+    resultString = '<mention-user>@here@gmail.com</mention-user><mention-here>@here</mention-here><mention-user>@here@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here@gmail.com@here@here+1@gmail.com';
+    resultString = '<mention-user>@here@gmail.com</mention-user><mention-here>@here</mention-here><mention-user>@here+1@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here+1@gmail.com@here@here+2@gmail.com';
+    resultString = '<mention-user>@here+1@gmail.com</mention-user><mention-here>@here</mention-here><mention-user>@here+2@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+
+    testString = '@here+1@gmail.com@here@here@here+2@gmail.com@here@here@gmail.com';
+    resultString = '<mention-user>@here+1@gmail.com</mention-user><mention-here>@here</mention-here><mention-here>@here</mention-here><mention-user>@here+2@gmail.com</mention-user><mention-here>@here</mention-here><mention-user>@here@gmail.com</mention-user>';
+    expect(parser.replace(testString)).toBe(resultString);
+});
+
 test('Test for mention inside link and email markdown', () => {
     const testString = '[@username@expensify.com](expensify.com) '
     + '[_@username@expensify.com_](expensify.com) '
diff --git a/lib/ExpensiMark.js b/lib/ExpensiMark.js
index e12a5ff1..50592e64 100644
--- a/lib/ExpensiMark.js
+++ b/lib/ExpensiMark.js
@@ -103,7 +103,7 @@ export default class ExpensiMark {
              */
             {
                 name: 'hereMentions',
-                regex: /([a-zA-Z0-9.!$%&+/=?^`{|}_-]?)(@here)([.!$%&+/=?^`{|}_-]?)(?=\b)(?!(@[a-zA-Z0-9-]+?(\.[a-zA-Z]+)+)|((?:(?!<a).)+)?<\/a>|[^<]*(<\/pre>|<\/code>))/gm,
+                regex: /([a-zA-Z0-9.!$%&+/=?^`{|}_-]?)(@here)([.!$%&+/=?^`{|}_-]?)(?=\b)(?!([\w'#%+-]*@(?:[a-z\d-]+\.)+[a-z]{2,}(?:\s|$|@here))|((?:(?!<a).)+)?<\/a>|[^<]*(<\/pre>|<\/code>))/gm,
                 replacement: (match, g1, g2, g3) => {
                     if (!Str.isValidMention(match)) {
                         return match;
@@ -121,15 +121,21 @@ export default class ExpensiMark {
              */
             {
                 name: 'userMentions',
-                regex: new RegExp(`[a-zA-Z0-9.!$%&+/=?^\`{|}-]?@+${CONST.REG_EXP.EMAIL_PART}(?!((?:(?!<a).)+)?<\\/a>|[^<]*(<\\/pre>|<\\/code>))`, 'gmi'),
-                replacement: (match) => {
+                regex: new RegExp(`(@here|[a-zA-Z0-9.!$%&+=?^\`{|}-]?)(@+${CONST.REG_EXP.EMAIL_PART})(?!((?:(?!<a).)+)?<\\/a>|[^<]*(<\\/pre>|<\\/code>))`, 'gim'),
+                replacement: (match, g1, g2) => {
                     if (!Str.isValidMention(match)) {
                         return match;
                     }
-                    return `<mention-user>${match}</mention-user>`;
+                    return `${g1}<mention-user>${g2}</mention-user>`;
                 },
             },
 
+            {
+                name: 'hereMentionAfterUserMentions',
+                regex: /(<\/mention-user>)(@here)(?=\b)/gm,
+                replacement: '$1<mention-here>$2</mention-here>',
+            },
+
             /**
              * Automatically link urls. Runs last of our linkers since we want anything manual to link before this,
              * and we do not want to break emails.