One approach:

• Make a hash with the keys being the abbreviations and the values the corresponding logo
• Use Regexp::Assemble to build up a regular expression from the keys of your hash which will capture the abbreviation
• Use that constructed regex against your filenames and then use $1 to key your hash lookup

I'm presuming this is some sort of HTML output and it's something like the path to an image. If you actually needed to munge the filename in some way the vaules in the hash could be coderefs instead which implement whatever particular substitution or other mungery you need.

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