Bash wildcards repeated match

Question

Can bash list with a repeated string? Lets say I wanted to match the files

config_foo_foo.txt
config_bar_bar.txt

but NOT

config_foo_bar.txt

something like

ls -l config_*_*.txt

matches all three. Would I have to use something like grep and a regular expression to get the behavior

Answer 1

Scott's answer looks right. With find it looks like this:

1.

find * -maxdepth 0 -regex "^config_\(.*\)_\1\.txt$"

Output:

config_foo_foo.txt
config_bar_bar.txt

2.

find . -mindepth 1 -maxdepth 1 -regex "^\./config_\(.*\)_\1\.txt$"

Output:

./config_foo_foo.txt
./config_bar_bar.txt

Answer 2

Yes, try the following code (using extented globs ) :

shopt -s extglob
ls config_!(*foo_bar*).txt

See

• man bash | less +/shopt.*optname
• http://wiki.bash-hackers.org/syntax/pattern
• http://mywiki.wooledge.org/glob

Answer 3

I believe you may need to do something like

command $(ls -d config_*_*.txt | grep '^config_\(.*\)_\1\.txt$')