How to modify this regex to include https?

I have this piece of regex that I'm using to create clickable links from URLs entered into a textarea. I did not write the code and am not sure how to modify it so that it will create links if the text s开发者_运维问答tarts with either http or https.

$html = preg_replace('"\b(http://\S+)"', '<a href="$1">$1</a>', stripslashes($rows['body']));

Adding a ? to the regex makes the preceding character optional.

$html = preg_replace('"\b(https?://\S+)"', '<a href="$1">$1</a>', stripslashes($rows['body']));

Replace

\b(http://\S+)

with:

\b(https?://\S+)

All together:

$html = preg_replace('"\b(https?://\S+)"', '<a href="$1">$1</a>', stripslashes($rows['body']));

No regex expert, so this might work:

$html = preg_replace('"\b(http://\S+|https://\S+)"', '<a href="$1">$1</a>', stripslashes($rows['body']));