If my RE is too long for a single line but rather simple, I just use /x without a comment within the RE (maybe there's one before, e.g
# replace all <a href="link"...>linktext</a>
# with [url="link"]linktext[/url]
s~<a \s+ href = "([^"]+)" [^>]* >
(Well, I know there are better ways to parse html than with REs, but it was the first example that came into my mind)
I only use g, s, m when really needed and not as default options.
perl -e "s>>*F>e=>y)\*martinF)stronat)=>print,print v188.8.131.52.11.32"