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You are right.
My mistake was that when I copied your RegEx I picked up a trailing 'space' character which caused the malfunction.

It seems to be a quirk of the Forum that it allows you to pick up a 'space', that shouldn't actually be there, when you copy a line!
Thanks for your quick response!

Using Version 7.09 (32 bit) of TextPad, I created a Macro to Search for the Video URLs in a YouTube Channel page.
I copied the Source HTML and pasted it into TextPad and then did the following:


Ctrl-Home

Find:
^\s+href="(/watch\?v=.+)"

Mark all (Bookmark line)
Search > Bookmark > Inverse ...

ben_josephs' solutions work fine EXCEPT when the numbers fall at the end of a line.
\< and \> anchor the expression to the start and end of a word but this FAILS at the end of a line.

Hence we need the following:

\<0*(20[1-9]|2[1-9][0-9]|[3-9][0-9]{2}|[1-9][0-9]{3,})($|\>)

to accommodate this ...

I was reporting a bug in the Portable Wizard and thus situated at:
http://www.textpad.com/support/textpad.php

When I clicked on the link to the Forums, I was taken to:
http://www.textpad.com/forum/index.php

The lack of an 's' at the end of the word 'forum' meant I was greeted with a 404 error ...