Regex doesnt match the file path in bash

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I've spent quite some time trying to figure out why this regex doesn't match files with names like: /var/tmp/app.0.attachments .... /var/tmp/app.11.attachments

    sudo rm -rf /var/tmp/app/\.([0-9]{1}|1[0-1]{1})/\.attachments

    $: -bash: syntax error near unexpected token `('

I've tried escaping '[', ']', | and {}

Please help.

asked 45 secs ago

user1071840

835

Regex doesnt match the file path in bash