Issue with Bash RegEx Handling

[Keith Thompson]

> > Firstly, why is =~ completely undocumented in the bash man page?  This
> > question was my first encounter with the feature.
>·
> Because it's not --- not undocumented, that is.  Manpage search can't
> seem to find it, but it _is_ there.
>·
> Just search for '==' instead, then go one paragraph down.

Searches in man pages are controlled by your pager ($PAGER or
$MANPAGER).  Your pager might be treating the ~ character specially.
Try searching for \~= .