How get range from regex matches

Question

I'm looking for a way to get the ranges from a regex match. I have a string

I'm looking for @{1 | Tom Lofe} and @{2 | Cristal Dawn}

From this string, I need to get the ranges of these matches using the following regex

"@\\{(\\d+) ?\\| ?(\\w+ *?\\w*?)\\}"

What is the best way to do this? So far I've only been able to get the matches but not the ranges. Apparently, the standard Swift function range(of: <#T##StringProtocol#>, options: <#T##String.CompareOptions#>, range: <#T##Range<String.Index>?#>, locale: <#T##Locale?#>) should be able to do this, but I don't know how to use it, and can't seem to find a good example.

I've also tried this question's answer get all ranges of a substring in a string in swift but again am unable to get it to work.

stackoverflow.com/questions/32305891/… You can use ranges(of:) with options: .regularExpression — Leo Dabus
– Leo Dabus, Commented Apr 25, 2018 at 11:13
Are you happy to mark my answer as correct as, I believe, it satisfies your original question and the subsequent variant raised. Thanks. Good question, by the way. — Scott McKenzie
– Scott McKenzie, Commented Apr 26, 2018 at 7:30

Scott McKenzie · Accepted Answer · 2018-04-25 13:06:12Z

2

This works in an Xcode Playground, but let me know if it doesn't work for you.

let regex = try! NSRegularExpression(pattern: "@\\{(\\d+) ?\\| ?(\\w+ *?\\w*?)\\}", options: [])

let input = "I'm looking for @{1 | Tom Lofe} and @{2 | Cristal Dawn}"
let range = NSRange(location: 0, length: input.utf16.count)

for match in regex.matches(in: input, options: [], range: range) {
    print(match.range)
}

Prints:

{16, 15}
{36, 19}

edited Apr 25, 2018 at 13:06

answered Apr 25, 2018 at 11:01

Scott McKenzie

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7 Comments

Martin R Over a year ago

Try this with let input = "😳I'm looking for @{1 | Tom Lofe} and @{2 | Cristal Dawn}"

Scott McKenzie Over a year ago

I’m not sure I understand, @MartinR Is this is a different question now?

Leo Dabus Over a year ago

@ScottMcKenzie you are using the wrong value for the length. you need to pass the utf16 count. NSRange(location: 0, length: input.utf16.count)

Martin R Over a year ago

Did you try it? Did you notice that only one range is printed? – You'll find an explanation in stackoverflow.com/a/27880748/1187415

Leo Dabus Over a year ago

@ScottMcKenzie Well I am showing to you what's wrong in your code. Feel free to keep your answer as it is if you would like to. Btw , options: [] is the default value therefore you can just omit it.

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