"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 class=\"example\">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 class=\"example\">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 class=\"example\">Example3:</strong></p>\n\n<pre>\n<strong>Input:</strong>s="1(234)567-890"\n<strong>Output:</strong>"***-***-7890"\n<strong>Explanation:</strong>sisaphonenumber.\nThereare10digits,sothelocalnumberis10digitsandthecountrycodeis0digits.\nThus,theresultingmaskednumberis"***-***-7890".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>s</code>iseithera<strong>valid</strong>emailoraphonenumber.</li>\n\t<li>If<code>s</code>isanemail:\n\t<ul>\n\t\t<li><code>8<=s.length<=40</code></li>\n\t\t<li><code>s</code>consistsofuppercaseandlowercaseEnglishlettersandexactlyone<code>'@'</code>symboland<code>'.'</code>symbol.</li>\n\t</ul>\n\t</li>\n\t<li>If<code>s</code>isaphonenumber:\n\t<ul>\n\t\t<li><code>10<=s.length<=20</code></li>\n\t\t<li><code>s</code>consistsofdigits,spaces,andthesymbols<code>'('</code>,<code>')'</code>,<code>'-'</code
"envInfo":"{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 20 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code>OpenJDK 17</code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu11 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n int id; /* we'll use this field as the key */\\r\\n char name[10];\\r\\n UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://githu
