I have a little problem with my pattern matching

I need to find a string into the text but I have to be sure that this is not part of a 
known
bigger string.

Example:

I need to find: /img/giallo.gif
but I have to be sure this is not: http://www.html.it/img/giallo.gif

notice that the string to find can be part of a string...like 
http://www.somedomain/img/giallo.gif

How can I do it?

Tnx
Francesco

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