Having issue with regex expression in camel.

Issue

• My Fuse blueprint is reading from CSV. I am trying to filter out lines that does not have any text .i.e. line with just ',' using regex.

<choice id="_choice1">
   <when id="_when1">
      <simple>${body} regex '[a-z].*'</simple>
         <log id="_log1" message="Data --> ${body}"/>
   </when>
   <otherwise id="_otherwise1">
     <log id="_log2" message="otherwise --> ${body}"/>
   </otherwise>
</choice>

• Data from CSV below.

Textbox1,,,,,,,,,,,,,,,,,,,,,,,,,,,
Report Date  11/05/2016,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,
SiteCode,Site_Description,SiteModulesComplted,
,,,,,,,,,,,,,,,,,,,,,,,,,,,
123,abc,my site, java training,

• Output

INFO  otherwise --> Textbox1,,,,,,,,,,,,,,,,,,,,,,,,,,,
INFO  otherwise --> Report Date  11/05/2016,,,,,,,,,,,,,,,,,,,,,,,,,,,
INFO  otherwise --> ,,,,,,,,,,,,,,,,,,,,,,,,,,,
INFO  otherwise --> SiteCode,Site_Description,SiteModulesComplted,