improve url matching regex

Now it support complex URLs and some other schemes beyond just http/ftp.

app/src/main/java/com/termux/app/TermuxActivity.java

@@ -654,19 +654,86 @@ public final class TermuxActivity extends Activity implements ServiceConnection
     }
 
     static LinkedHashSet<CharSequence> extractUrls(String text) {
-        // Pattern for recognizing a URL, based off RFC 3986
+
-        // http://stackoverflow.com/questions/5713558/detect-and-extract-url-from-a-string
+        StringBuilder regex_sb = new StringBuilder();
+
+        regex_sb.append("(");                       // Begin first matching group.
+        regex_sb.append("(?:");                     // Begin scheme group.
+        regex_sb.append("dav|");                    // The DAV proto.
+        regex_sb.append("dict|");                   // The DICT proto.
+        regex_sb.append("dns|");                    // The DNS proto.
+        regex_sb.append("file|");                   // File path.
+        regex_sb.append("finger|");                 // The Finger proto.
+        regex_sb.append("ftp(?:s?)|");              // The FTP proto.
+        regex_sb.append("git|");                    // The Git proto.
+        regex_sb.append("gopher|");                 // The Gopher proto.
+        regex_sb.append("http(?:s?)|");             // The HTTP proto.
+        regex_sb.append("imap(?:s?)|");             // The IMAP proto.
+        regex_sb.append("irc(?:[6s]?)|");           // The IRC proto.
+        regex_sb.append("ip[fn]s|");                // The IPFS proto.
+        regex_sb.append("ldap(?:s?)|");             // The LDAP proto.
+        regex_sb.append("pop3(?:s?)|");             // The POP3 proto.
+        regex_sb.append("redis(?:s?)|");            // The Redis proto.
+        regex_sb.append("rsync|");                  // The Rsync proto.
+        regex_sb.append("rtsp(?:[su]?)|");          // The RTSP proto.
+        regex_sb.append("sftp|");                   // The SFTP proto.
+        regex_sb.append("smb(?:s?)|");              // The SAMBA proto.
+        regex_sb.append("smtp(?:s?)|");             // The SMTP proto.
+        regex_sb.append("svn(?:(?:\\+ssh)?)|");     // The Subversion proto.
+        regex_sb.append("tcp|");                    // The TCP proto.
+        regex_sb.append("telnet|");                 // The Telnet proto.
+        regex_sb.append("tftp|");                   // The TFTP proto.
+        regex_sb.append("udp|");                    // The UDP proto.
+        regex_sb.append("vnc|");                    // The VNC proto.
+        regex_sb.append("ws(?:s?)");                // The Websocket proto.
+        regex_sb.append(")://");                    // End scheme group.
+        regex_sb.append(")");                       // End first matching group.
+
+
+        // Begin second matching group.
+        regex_sb.append("(");
+
+        // User name and/or password in format 'user:pass@'.
+        regex_sb.append("(?:\\S+(?::\\S*)?@)?");
+
+        // Begin host group.
+        regex_sb.append("(?:");
+
+        // IP address (from http://www.regular-expressions.info/examples.html).
+        regex_sb.append("(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)|");
+
+        // Host name or domain.
+        regex_sb.append("(?:(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)(?:(?:\\.(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))?|");
+
+        // Just path. Used in case of 'file://' scheme.
+        regex_sb.append("/(?:(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)");
+
+        // End host group.
+        regex_sb.append(")");
+
+        // Port number.
+        regex_sb.append("(?::\\d{1,5})?");
+
+        // Resource path with optional query string.
+        regex_sb.append("(?:/[a-zA-Z0-9:@%\\-._~!$&()*+,;=?/]*)?");
+
+        // End second matching group.
+        regex_sb.append(")");
+
         final Pattern urlPattern = Pattern.compile(
-            "(?:^|[\\W])((ht|f)tp(s?)://|www\\.)" + "(([\\w\\-]+\\.)+?([\\w\\-.~]+/?)*" + "[\\p{Alnum}.,%_=?&#\\-+()\\[\\]*$~@!:/{};']*)",
+            regex_sb.toString(),
             Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
+
         LinkedHashSet<CharSequence> urlSet = new LinkedHashSet<>();
         Matcher matcher = urlPattern.matcher(text);
+
         while (matcher.find()) {
             int matchStart = matcher.start(1);
             int matchEnd = matcher.end();
             String url = text.substring(matchStart, matchEnd);
             urlSet.add(url);
         }
+
         return urlSet;
     }