How to replace a substring in a string in Swift [duplicate]

Question

my code is like the following:

let fileName = "/users/lezi/downloads/Zootopia.srt"
var srtFile = try? String(contentsOfFile: fileName)
let range = srtFile?.range(of: "00:00:59,825")
print(srtFile?[range!])
srtFile?.replaceSubrange(range!, with: "00:00:59,826")
print(srtFile?[range!])

I hope the "00:00:59,825" is replaced to "00:00:59,826", but the print is "Optional("\r\n\r\n2")\n", some characters just before "00:00:59,825"

Cannot reproduce. A (self-contained) minimal reproducible example is needed. — Martin R
– Martin R, Commented Jun 22, 2020 at 12:10
What language is the srt file for, maybe this is caused by some encoding issue? — Joakim Danielson
– Joakim Danielson, Commented Jun 22, 2020 at 12:21
I can reproduce this with a Chinese srt file, then I also get some garbage in the second print. Using replacingoccurenzces(of:with) seems to work though so it seems that this should be closed as a duplicate — Joakim Danielson
– Joakim Danielson, Commented Jun 22, 2020 at 12:34
@JoakimDanielson: Using range(of:) and replaceSubrange() should work as well (and is not equivalent to replacingOccurrences(of:with:)). I think it would be more helpful to figure out why the above code does not work as expected (instead of closing as a duplicate of a question about a different method). — Martin R
– Martin R, Commented Jun 22, 2020 at 12:40
@MartinR You are right. The replaceSubrange function works fine, it is the second print(srtFile?[range]) statement that doesn't work. If I print the whole file I can see the change. So I guess this then should be closed as "Can not reproduce"? — Joakim Danielson
– Joakim Danielson, Commented Jun 22, 2020 at 12:49

Kevin Siundu · Accepted Answer · 2020-06-22 12:06:57Z

5

You can try using replacingOccurrences(of:with:). Returns a new string in which all occurrences of a target string in the receiver are replaced by another given string

sample example :

let str = "Swift 4.0 is the best version of Swift to learn, so if you're starting fresh you should definitely learn Swift 4.0."
let replaced = str.replacingOccurrences(of: "4.0", with: "5.0")

answered Jun 22, 2020 at 12:06

Kevin Siundu

665 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Cœur Over a year ago

Thank you, but if that's the answer, the question is then a duplicate of stackoverflow.com/questions/24200888/…

龙方哲 Over a year ago

replacingOccurrences and replaceSubrange both works, but the range got before replaceSubrange seems invalid after replaceSubrange is executed

Sudip Ghimire · Accepted Answer · 2020-06-22 12:08:08Z

1

Regardless of use case. The common syntax to replace the substring is:

str.replacingOccurrences(of: "replace_this", with: "with_this")

where replace_thisis the text string you want to replace and ```with_this`` is the new sub-string to insert.

answered Jun 22, 2020 at 12:08

Sudip Ghimire

7156 silver badges17 bronze badges

2 Comments

Cœur Over a year ago

Thank you, but if that's the answer, the question is then a duplicate of stackoverflow.com/questions/24200888/…

Worik Over a year ago

Yes. It is a method of String.NSString not a method of String. Makes it hard to find!

Collectives™ on Stack Overflow

How to replace a substring in a string in Swift [duplicate]

2 Answers 2

2 Comments

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

2 Comments

Linked

Related