bash, find files which contain numbers on filename

In bash, I would like to use the command find to find files which contain the numbers from 40 to 70 in a certain position like c43_data.txt. How is it possible to implement this filter in find?

I tried file . -name "c**_data.txt" | gr开发者_运维技巧ep 4, but this is not very nice.

Thanks

Perhaps something like:

find . -regextype posix-egrep -regex "./c(([4-6][0-9])|70)_data.txt"

This matches 40 - 69, and 70.

You may also use the iregex option for case-insensitive matching.

$ ls
c40_data.txt  c42_data.txt  c44_data.txt  c70_data.txt  c72_data.txt  c74_data.txt
c41_data.txt  c43_data.txt  c45_data.txt  c71_data.txt  c73_data.txt  c75_data.txt

$ find . -type f \( -name "c[4-6][0-9]_*txt" -o -name "c70_*txt" -o -name "c[1-2][3-4]_*.txt" \) -print
./c43_data.txt
./c41_data.txt
./c45_data.txt
./c70_data.txt
./c40_data.txt
./c44_data.txt
./c42_data.txt

Try something like:

find . -regextype posix-egrep -regex '.\*c([3-6][0-9]|70).\*'

with the appropriate refinements to limit this to the files you want

ls -R | grep -e 'c[4-7][0-9]_data.txt'

find can be used in place of ls, obviously.