regular expressions help please

I'm trying to find files in my array for example ="lg_imode.gif" and ="/db/imodeklein/edgar-IMODE-1-.gif" I want to differentiate between the files with slash at the front and ones without so that I can add a server path ! but as usual I' m having problems with the correct regex At the moment I've got this to find files with forward slash eregi_replace("([^\"]+[/+]+[a-z_/-]+[gif]+[/$])" , and it seems to work.(although I think it's wrong) And I'm trying this to find the files without the slash at the front eregi_replace("([^\"]+(a-z_)+[gif]$)" , which is definately not working. ....help !