Command works in shell but not in a script

Question

I'm using the command ls files/@(*.text|*.txt|*.xt) to get all files that end with any of the patterns.

When I run it in the shell I get this result

$ ls files/@(*.text|*.txt|*.xt)
files/f1.text  files/f1.txt  files/f1.xt

When I create a bash script, it throws the error ls: cannot access files/@(*.text|*.txt|*.xt): No such file or directory

Here is a copy of my bash script

#!/bin/bash

ls files # this one works
ls files/@\(*.text\|*.txt\|*.xt\) # This doesn't work

full output when running the bash script

$ ./testScript.sh 
files/f1.text  files/f1.txt  files/f1.xt
ls: cannot access files/@(*.text|*.txt|*.xt): No such file or directory

Confirmed the shell is a bash shell

$ echo $SHELL
/bin/bash

I also tried:

• ls files/@\(*.text|*.txt|*.xt\) - throws line 4: *.xt): command not found
• ls files/@(*.text|*.txt|*.xt) - throws line 4: syntax error near unexpected token ('`
• running with sh ./testScript.sh - same error as original error.
• using /files/@(*.text|*.txt|*.xt) - no luck (same error as above in this list)

Answer 1

You enable extglob in your script with shopt -s extglob.