Regular expression for extracting a number

Question

I would like to be able to extract a number from within a string formatted as follows:

\"<[1085674730]> hello foo1, how are you doing?\"

I\'m a novice wit

Answer 1

Use:

/<\[([[:digit:]]+)\]>/

If your implementation doesn't support the handy [:digit:] syntax, then use this:

/<\[([\d]+)\]>/

And if your implementation doesn't support the handy \d syntax, then use this:

/<\[([0-9]+)\]>/