dear monks,

i have a A regular expression(or regex) in my perl script. 

this is the code snippet, 

 if ($this_in =~ /^dn: /gio)

i know what does the "g" and "i" means, as below. 
g - DO globally pattern matching.
i - Do case-insensitive pattern matching.

can somebody please explain to me whats the "o"  means. 

i would like to thank you guys in advanced for helping..

anakin30.....