Issue #2016739 by richardbporter, larowlan, aalamaki, afox, wroxbox,...

Issue #2016739 by richardbporter, larowlan, aalamaki, afox, wroxbox, mark_fullmer, mohit_aghera, ayushmishra206, rakesh.gectcr, NikolaAt, rteijeiro, tanubansal, amietpatial, jibran, alexpott, Wim Leers: Links with "@" are converted into email addresses even if there is no domain suffix present

core/modules/filter/filter.module

@@ -490,9 +490,12 @@ function _filter_url($text, $filter) {
 
   // Prepare domain name pattern.
   // The ICANN seems to be on track towards accepting more diverse top level
-  // domains, so this pattern has been "future-proofed" to allow for TLDs
-  // of length 2-64.
+  // domains (TLDs), so this pattern has been "future-proofed" to allow for
+  // TLDs of length 2-64.
   $domain = '(?:[\p{L}\p{M}\p{N}._+-]+\.)?[\p{L}\p{M}]{2,64}\b';
+  // Mail domains differ from the generic domain pattern, specifically:
+  // A . character must be present in the string that follows the @ character.
+  $email_domain = '(?:[\p{L}\p{M}\p{N}._+-]+\.)+[\p{L}\p{M}]{2,64}\b';
   $ip = '(?:[0-9]{1,3}\.){3}[0-9]{1,3}';
   $auth = '[\p{L}\p{M}\p{N}:%_+*~#?&=.,/;-]+@';
   $trail = '(' . $valid_url_path . '*)?(\\?' . $valid_url_query_chars . '*' . $valid_url_query_ending_chars . ')?';
@@ -503,7 +506,7 @@ function _filter_url($text, $filter) {
   $tasks['_filter_url_parse_full_links'] = $pattern;
 
   // Match email addresses.
-  $url_pattern = "[\p{L}\p{M}\p{N}._+-]{1,254}@(?:$domain)";
+  $url_pattern = "[\p{L}\p{M}\p{N}._+-]{1,254}@(?:$email_domain)";
   $pattern = "`($url_pattern)`u";
   $tasks['_filter_url_parse_email_links'] = $pattern;
 

core/modules/filter/tests/filter.url-input.txt

@@ -9,6 +9,7 @@ This is just a www.test.com. paragraph with person@test.com. some http://www.tes
 http://www.test.com
 www.test.com
 person@test.com
+person@test
 <code>www.test.com</code>
 http://test.com/?search=test
 http://test.com/?search=Test
@@ -28,6 +29,7 @@ The old URL filter has problems with <a title="kind of link www.example.com with
 <dt>www.test.com</dt>
 <dd>http://www.test.com</dd>
 <dd>person@test.com</dd>
+<dd>person@test</dd>
 <dt>check www.test.com</dt>
 <dd>this with some text around: http://www.test.com not so easy person@test.com now?</dd>
 </dl>

core/modules/filter/tests/filter.url-output.txt

@@ -9,6 +9,7 @@ This is just a <a href="http://www.test.com">www.test.com</a>. paragraph with <a
 <a href="http://www.test.com">http://www.test.com</a>
 <a href="http://www.test.com">www.test.com</a>
 <a href="mailto:person@test.com">person@test.com</a>
+person@test
 <code>www.test.com</code>
 <a href="http://test.com/?search=test">http://test.com/?search=test</a>
 <a href="http://test.com/?search=Test">http://test.com/?search=Test</a>
@@ -28,6 +29,7 @@ The old URL filter has problems with <a title="kind of link www.example.com with
 <dt><a href="http://www.test.com">www.test.com</a></dt>
 <dd><a href="http://www.test.com">http://www.test.com</a></dd>
 <dd><a href="mailto:person@test.com">person@test.com</a></dd>
+<dd>person@test</dd>
 <dt>check <a href="http://www.test.com">www.test.com</a></dt>
 <dd>this with some text around: <a href="http://www.test.com">http://www.test.com</a> not so easy <a href="mailto:person@test.com">person@test.com</a> now?</dd>
 </dl>