Rails Regular Expression

Question

I'm really new to regular expression. I have the following url: http://www.foo.bar.com/hgur_300x300.jpg and http://www.foo.bar.com/hgur_100x100.jpg

How would I use gsub with regular expression in rails to find [300X300.jpg AND 180X180.jpg] and replace it with 500X500?

Answer 1

"http://www.foo.bar.com/hgur_100x100.jpg".gsub(/\d+/, "500")

will replace the two "100" with "500"

UPDATE:

"http://www.foo.bar.com/hgur_100x100.jpg".gsub(/\d+x\d+/, "500x500")

will be more precise