A pattern for matching e-mail addresses

A regular expression pattern for use in JavaScript, PHP, or whatever language you use that supports them.

^[-a-z0-9._+]+@[-a-z0-9._]+\\.[-a-z0-9._]{2,6}$

Supports addresses with periods and plus signs (e.g. ‘tiffany.brown’ or ‘hotc0derch1ck+todolist’)
Supports top-level British and Australian domain names such as ‘.co.uk’ and ‘.com.au’
Supports new top-level domains including ‘.museum’ and ‘.travel’
May need to use a case-insensitive modifier
Should convert the string to lower case and trim whitespace from each end before comparting to the pattern.

Improvements? Questions? Share with us in the comments.