renamefiles.sh

#!/bin/bash

# ./renamefiles.sh directory
#

ls *$1 | egrep 'regex here+' \
	| while read f 
		do
			# if you need remove some character
 			tna=$(echo $f | sed 's/regex here//')
 			echo "$1/$f" "$1/$tna"
 			# mv "$1/$f" "$1/$tna"

 			# if you need replace some character
 			echo "$1/$f" "$1/${f/old/new}"
 			# mv "$1/$f" "$1/${tna/old/new}"
		done