I agree with your sentiments on strict.

I often test things like regexes from the commandline before adding to application code. I always include warnings and strictures in these tests:

perl -we 'use strict; ...'
[download]

Whenever I fiddle with these in a script or module, I tend to go into blatently-obvious-defensive-progamming mode:

NO_ONCE_ONLY_WARNINGS_ZONE:
{
    no warnings qw(once);
    . . .
    use warnings qw(once);
}
[download]

I am often told this is overkill: usually by people that do a lot more debugging than me :-)