Regular to find string include IP address - javascript [on hold]

I would like to find string that include IP address inside in javaScript, I need the all the string not only the IP.

example for string: "accesslogs_100.74.196.29_20150210"

I try this one:

str.match(/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/)

Thanks, Cfir.