May conflict with the wordpress php function is_email(). [1]
According to W3Techs, WordPress powers 43% of all the
websites on the Internet, including those without a
content management system (CMS) or with a custom-coded
CMS. Or to put it another way, WordPress powers over
one-third of the web! And if you limit the data set
to only websites with a known CMS, WordPress’ market
share gets even more dominant.
In that case, WordPress holds a 65% market share
for content management systems on websites with a
known CMS.