Bash Globbing Variable Substitution?

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http://unix.stackexchange.com – I want to rename files using their existing name as a base for the new one. So if I can ls these files with ls blue*+(.png) I'd want to rename them something like mv blue$(*)+(.png) $(1).png except that doesn't work obviously. Is there syntax for these kind of variables in bash globbing or is there an easier way? (HowTos)