Tomasz Ostrowski

With this plugin you can define a PCRE regular expression against which data entered 
in XProfile fields will be matched.
For example:
<ul>
<li>check webpage field for a correct(-ish) URL or domain name: <code>%^(https?://)?([^ :/]{1,63}\.)+[^ :/.]{2,63}%iu</code></li>
<li>check age field for a sane(-ish) value (0-199): <code>/^1?[0-9]?[0-9]$/</code></li>
<li>check phone field for a sane(-ish) value: <code>/^+?[0-9 -]{7,45}$/</code></li>
<li>check any field for a minimum and maksimum length: <code>/^.{10,100}$/u</code></li>
</ul>
You can also configure a message to show when a field data does not validate.

BuddyPress XProfile Validate with RegEx

BuddyPress - Validate XProfile data with PCRE regular expressions.

netlatch

The plugin gives bloggers a easy way to provide a link for readers to contact them without using scripts or work arounds such john(at)doe.com.
Using this plugin will allow direct communication bewteen the writer and the readers without exposing the writers email address to spammers or spam bots.
The plugin appends a link at the end of all the bloggers posts. This link is to the bloggers Yougler Profile page where readers can read a little bit about the blogger or blog and send mail-forwarded email. This keeps the blogger from getting spam while allowing the writer and readers to communicate easily.

Yougler Blogger Profile Page

The plugin adds links to bloggers posts for readers to contact them without scripts or work-a-rounds like my email is john (at) doe.com.

BuddyPress XProfile Validate with RegEx vs Yougler Blogger Profile Page