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"content": "<p>You are given a personal information string <code>s</code>, representing either an <strong>email address</strong> or a <strong>phone number</strong>. Return <em>the <strong>masked</strong> personal information using the below rules</em>.</p>\n\n<p><u><strong>Email address:</strong></u></p>\n\n<p>An email address is:</p>\n\n<ul>\n\t<li>A <strong>name</strong> consisting of uppercase and lowercase English letters, followed by</li>\n\t<li>The <code>'@'</code> symbol, followed by</li>\n\t<li>The <strong>domain</strong> consisting of uppercase and lowercase English letters with a dot <code>'.'</code> somewhere in the middle (not the first or last character).</li>\n</ul>\n\n<p>To mask an email:</p>\n\n<ul>\n\t<li>The uppercase letters in the <strong>name</strong> and <strong>domain</strong> must be converted to lowercase letters.</li>\n\t<li>The middle letters of the <strong>name</strong> (i.e., all but the first and last letters) must be replaced by 5 asterisks <code>"*****"</code>.</li>\n</ul>\n\n<p><u><strong>Phone number:</strong></u></p>\n\n<p>A phone number is formatted as follows:</p>\n\n<ul>\n\t<li>The phone number contains 10-13 digits.</li>\n\t<li>The last 10 digits make up the <strong>local number</strong>.</li>\n\t<li>The remaining 0-3 digits, in the beginning, make up the <strong>country code</strong>.</li>\n\t<li><strong>Separation characters</strong> from the set <code>{'+', '-', '(', ')', ' '}</code> separate the above digits in some way.</li>\n</ul>\n\n<p>To mask a phone number:</p>\n\n<ul>\n\t<li>Remove all <strong>separation characters</strong>.</li>\n\t<li>The masked phone number should have the form:\n\t<ul>\n\t\t<li><code>"***-***-XXXX"</code> if the country code has 0 digits.</li>\n\t\t<li><code>"+*-***-***-XXXX"</code> if the country code has 1 digit.</li>\n\t\t<li><code>"+**-***-***-XXXX"</code> if the country code has 2 digits.</li>\n\t\t<li><code>"+***-***-***-XXXX"</code> if the country code has 3 digits.</li>\n\t</ul>\n\t</li>\n\t<li><code>"XXXX"</code> is the last 4 digits of the <strong>local number</strong>.</li>\n</ul>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "LeetCode@LeetCode.com"\n<strong>Output:</strong> "l*****e@leetcode.com"\n<strong>Explanation:</strong> s is an email address.\nThe name and domain are converted to lowercase, and the middle of the name is replaced by 5 asterisks.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "AB@qq.com"\n<strong>Output:</strong> "a*****b@qq.com"\n<strong>Explanation:</strong> s is an email address.\nThe name and domain are converted to lowercase, and the middle of the name is replaced by 5 asterisks.\nNote that even though "ab" is 2 characters, it still must have 5 asterisks in the middle.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "1(234)567-890"\n<strong>Output:</strong> "***-***-7890"\n<strong>Explanation:</strong> s is a phone number.\nThere are 10 digits, so the local number is 10 digits and the country code is 0 digits.\nThus, the resulting masked number is "***-***-7890".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>s</code> is either a <strong>valid</strong> email or a phone number.</li>\n\t<li>If <code>s</code> is an email:\n\t<ul>\n\t\t<li><code>8 <= s.length <= 40</code></li>\n\t\t<li><code>s</code> consists of uppercase and lowercase English letters and exactly one <code>'@'</code> symbol and <code>'.'</code> symbol.</li>\n\t</ul>\n\t</li>\n\t<li>If <code>s</code> is a phone number:\n\t<ul>\n\t\t<li><code>10 <= s.length <= 20</code></li>\n\t\t<li><code>s</code> consists of digits, spaces, and the symbols <code>'('</code>, <code>')'</code>, <code>'-'</code>, and <code>'+'</code>.</li>\n\t</ul>\n\t</li>\n</ul>\n",
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