We can write as following type of format:

Newline      :      [ln: ]

Tab      :      [tab: ]

Highlight method 1      :      [hl1: ]Highlight method 1[/:hl1 ]

Highlight method 2      :      [hl2: ]Highlight method 1[/:hl2 ]

Font size 1      :      [fontsize1: ]Font size 1[/:fontsize1 ]

Font size 2      :      [fontsize2: ]Font size 2[/:fontsize2 ]

Bold      :      [bold: ]Bold[/:bold ]

Italic      :      [italic: ]Italic[/:italic ]

getans link      :      [ link:http://www.getans.com: ]getans link[/:link ]

getans link      :      [ link:http://www.getans.com:title:getans: ]getans link[/:link ]

[blockquote: ]This is quotted text[/:blockquote ]      

This is quotted text

[code: ]
<?php
       $color = "red";
       echo "My car is " . $color . "<br>";
       echo "My house is " . $COLOR . "<br>";
       echo "My boat is " . $coLOR . "<br>";
?>
[/:code ]

<?php
    $color = "red";
    echo "My car is " . $color . "<br>";
    echo "My house is " . $COLOR . "<br>";
    echo "My boat is " . $coLOR . "<br>";
?>

Note: No space character in between [ ].