Syntax

<esc>text<\esc> 

Or:

<esc|text|

If the long form is used, the text cannot contain the three-character sequence <\x (the less-than symbol followed by a backslash followed by a letter). If the short form is used, the text cannot contain the |(vertical bar) character.

If you use the first syntax, the <\esc> end tag is required.