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Regex Tag - uri

Get IP address - simple non capturing example

?: is used when you want to group an expression, but you do not want to save it as a matched/captured portion of the string. An example would be something to match an IP address: (?:\d{1,3}\.){3}\d{1,3} Note that I don't care about saving the first 3 octets, but the (?:...) grouping allows me to shorten the regex without incurring the overhead of capturing and storing a match.

Type: match, Date: 7/12/2015 3:29:13 PMAuthor: stackoverflow

Simple example - non capturing group

If I apply the regex below over it: (http|ftp)://([^/\r\n]+)(/[^\r\n]*)? I would get the following result: Match "http://stackoverflow.com/" Group 1: "http" Group 2: "stackoverflow.com" Group 3: "/" But I don't care about the protocol - I just want the host and path of the URL. So, I change the regex to include the non-capturing group (?:): (?:http|ftp)://([^/\r\n]+)(/[^\r\n]*)? Now, my result looks like this: Match "http://stackoverflow.com/" Group 1: "stackoverflow.com" Group 2: "/"

Type: match, Date: 7/12/2015 3:23:20 PMAuthor: stackoverflow