<p><a href="source.lasso?P=[String_GetField:-FieldNumber=(String_CountFields:-Delimiter='/',(Response_FilePath)),-Delimiter='/',(Response_FilePath),-EncodeURL]">show source</a>

create file "source.lasso" containing:

[Content_Type:'text/plain']<pre>[Encode_HTML:(Include_Raw:(Action_Param:'P'))]</pre>