GNU sed 4.1.5 doesn't have -E

[alef]

Replacing with -r or --regexp-extended works for init/bash_completion

[xdelaruelle]

Thanks for the report. Option -E is used on purpose to achieve portability across OSes, see b68e44e.

I was not aware this -E option was rather recent on GNU sed.

The quick fix: I will add a check at configure step to detect if sed -E is supported on the platform and fallback to sed -r otherwise.

A more sustainable solution: directly use the output from module avail as input for completion scripts without need to call for external commands like sed.