Your email regex doesn't accept some basic patterns, like foo+bar@foobar.com. Also, a lot of newer TLDs can be longer than 6 symbols, like ".clothing".

See [1] or [2] for some inspiration.

[1] https://news.ycombinator.com/item?id=12448844 [2] https://news.ycombinator.com/item?id=9089129

Your hex value does not accept uppercase values. Might I suggest this instead:

    #([a-fA-F0-9]{3}){1,2}\b

Neither of ours accepts 8 character Hex values (transparency in 7th and 8th characters).

I have some more to share:

    Match the 'src' for images
    \< *[img][^\>]*[src] *= *[\"\']{0,1}([^\"\'\ >]*)

    Match ID's for Youtube Videos
    /http:\/\/(?:youtu\.be\/|(?:[a-z]{2,3}\.)?youtube\.com\/watch(?:\?|#\!)v=)([\w-]{11}).*/gi

    Match CSS comments
    \/\*[^*]*\*+([^/*][^*]*\*+)*\/

    Match every word except words in list:
    \bTarzan\b|\bJane\b|\bSuperman\b|(\w+);