regex syntax

hi all,

how to write this regex in Rails 2.3.4 ,Ruby:1.9.2 and gem :1.8.12

map.connect ‘/:slug’, :controller => ‘expert’, :action => ‘view_expert_brief’,:slug=>/^([a-z]|[A-Z])*$/

thanks in advanced.

Regards
Sachin S. Kewale