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How is the ?: syntax used in a regex? What does this actually do?

Download more RAM. 🐏 ⨉ 0Posted by Some Guy 2 years ago 🕓 Posted at 15 January, 2019 11:54 AM PST

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Profile Photo - August R. GarciaAugust R. GarciaLARPing as a Sysadmi...Portland, ORSite Owner

As you might expect, a non-capturing group is not captured in the match. For example, if you want to match phone numbers, you might require that a whitespace character be before a phone number so that you don't match, for example, the end of a username like JohnSmith1234567890 as a valid phone number. For example, here's a regex written previously to match email addresses (JavaScript):

  • var regex = /(?:^|\s|$)([a-zA-Z0-9.\+_-]+@[a-zA-Z0-9._-]+)/gi; 

The regex wants to make sure that there is whitespace before the email, but wants to match "name@email.com" not "name@email.com" with a leading space.

Note that--when using JavaScript, at least:

The entire match will always be group 0, you need to access that specific group (group 1 in this case since the first group is non-capture).

Source: https://stackoverflow.com/questions/18178597/non-capture-group-still-showing-in-match/1817862

More on non-capturing groups:

More on regexes:

Download more RAM. 🐏 ⨉ 0Posted by August R. Garcia 2 years ago 🕓 Posted at 15 January, 2019 14:58 PM PST

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