Parse a string with specific condition

Question

How can I trim my string which is in this form:

https://xxx.kflslfsk.com/kjjfkskfjksf/v1/files/media/93939393hhs8.jpeg

to this?

media/93939393hhs8.jpeg

I want to remove all the characters before the second to last slash /.

I can use stringByTrimmingCharactersInSet but I don't know how to specify the condition that I want:

let trimmedString = myString.stringByTrimmingCharactersInSet(
  NSCharacterSet.whitespaceAndNewlineCharacterSet() // what here in my case ??
)

The above is for removing the white spaces, but that is not the case here.

vadian · Accepted Answer · 2016-08-21 12:46:44Z

4

Since the string is an URL get the path components, remove anything but the last 2 items and join the items with the slash separator.

if let url = NSURL(string:"https://xxx.kflslfsk.com/kjjfkskfjksf/v1/files/media/93939393hhs8.jpeg"), pathComponents = url.pathComponents {
  let trimmedString = pathComponents.suffix(2).joinWithSeparator("/")
  print(trimmedString)
}

edited Aug 21, 2016 at 12:46

answered Aug 21, 2016 at 12:43

vadian

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4 Comments

remy boys Over a year ago

@vadian exactly what i needed , thanks a lot , appreciate your effort man

Duncan C Over a year ago

Cool. I knew about NSURLComponents, but not the NSURL property pathComponents. Thanks for teaching me a new trick. (Voted.)

Duncan C Over a year ago

I assume pathComponents trims away things like query strings?

vadian Over a year ago

@DuncanC Yes, the path is everything between the host which is xxx.kflslfsk.com in the example and the query (?) separator

Duncan C · Accepted Answer · 2016-08-21 12:36:02Z

1

You're not trimming, you're parsing.

There's no single call that will do what you want. I suggest writing a block of code that uses componentsSeparatedByString("\n") to break it into lines (one URL per line), then parse each line separately.

You could use componentsSeparatedByString("/") on each line to break it into the fragments between your slashes, and then assemble the last 2 fragments together.

(I'm deliberately not writing out the code for you. You should do that for yourself. I'm just pointing you in the right direction.)

You might also be able to use NSURLComponents to treat each line as a URL, but I'm not sure how you'd get the last part of URL before the filename (e.g. "media " or "lego") with that method.

answered Aug 21, 2016 at 12:36

Duncan C

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1 Comment

remy boys Over a year ago

@DunanC seems like my example was not clear enough its just a line of string (see the updated question ) , i putted extra lines for better understanding (it didn't helped though ) I'm just pointing you in the right direction its enough for me thanks for responding :) appreciate your effort man

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