Extract an ISBN with regex

Question

I have an extremely long string that I want to parse for a numeric value that occurs after the substring \"ISBN\". However, this grouping of 13 digits can be arranged differ

Answer 1

You can strip out the dashes with string manipulation, or you could use this:

"\\b(?:\\d-?){13}\\b"

It has the added bonus of making sure the string doesn't start or end with -.