Get the string up to a specific character

Question

var hello = \"hello, how are you?\"

var hello2 = \"hello, how are you @tom?\"

i want to delete every letter behind the @ sign.

result shou

Answer 1

You need to find the range of the "@" and then use it to create a substring up to the index before.

import Foundation

let text = "hello, how are you @tom?"

if let range = text.range(of: "@") {
    let result = text.substring(to: range.lowerBound)
    print(result) // "hello, how are you "
}

Considerations

Please note that, following the logic you described and using the input text you provided, the output string will have a blank space as last character

Also note that if multiple @ are presente in the input text, then the first occurrence will be used.

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Last index [Update]

I am adding this new section to answer the question you posted in the comments.

If you have a text like this

let text = "hello @tom @mark @mathias"

and you want the index of the last occurrency of "@" you can write

if let index = text.range(of: "@", options: .backwards)?.lowerBound {
    print(index)    
}