YouTube profile ID regex

[ZiNgA BuRgA]

I'm not too sure how you'd differentiate between a channel and a user (is there a distinction?), but you could just simply take your existing regex and make the first part optional.

Code:

(?:((http|https):\/\/|)(www\.)?youtube\.com\/(channel\/|user\/))?[a-zA-Z0-9]{1,}

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It's probably possible to just store the ID in the database if you make use of the input formatter (find the last '/' character and take everything from there).