CODEWITHSUNDEEP
iosobjective-cregexfiltersubstring
felixwcf
felixwcf

Reputation: 2105

iOS: Get all characters after the last '/' (slash) from url string

How to get all characters after the last '/' (slash) from url string?

I receive a json string from my URL scheme when making webview request for certain site. For example:

app://ga/ecommerce/%7B%22product%22:%22playstation4%22...}]

I would like to grab the substring after the last '/'(slash).

How can I achieve it? May I know what is the format of Regex?

Avoid to use 

NSRange lastDotRange = [sURL rangeOfString:@"/" options:NSBackwardsSearch];

because I might have escaped '/' in my json.

Thank you.

Upvotes: 13

Views: 13068

Answers (7)

ingconti
ingconti

Reputation: 11646

some Swift samples, to get the "query" and last part of an url. Note if You have a string, you have to create an URL, so the URL class can manage correctly the parts. (String has no capabilities to perform so).

sample:

let s = "https://example.com/search?q=Display+iphone"
let url = URL(string: s)
let lastOnUrl = url?.lastPathComponent
let query = url?.query
print("lastOnUrl:", lastOnUrl!)
print("query:    ", query!)

You will get:

lastOnUrl: search

query: q=Display+iPhone

Upvotes: 0

9BallOnTheSnap
9BallOnTheSnap

Reputation: 599

For Swift 3 try this. 

let fileName = "your/file/name/here"
let fileArray = fileName?.components(separatedBy: "/")
let finalFileName = fileArray?.last

Output : "Here"

Upvotes: 32

felixwcf
felixwcf

Reputation: 2105

Well it seems like using Regex is quite expensive inside shouldStartLoadWithRequest delegate especially if you're having hybrid app which has plenty webviews. Some of my websites in webview might have more than one request, some are running at the background. It's painful if the webview triggers regex codes everytime when webview loads the request.

And also, I have escaped '/' in my last component params (json string), it might cause the lastComponent breaks after the escaped '/' character.

Therefore I stick to the codes filtering by using if-else statements and also compare strings with components of URL For example

request.URL.absoluteString
request.URL.host
request.URL.fragment

and also found out that @Nitin Gohel is useful.

Upvotes: 0

winner.ktw
winner.ktw

Reputation: 471

try this:

    NSURL *url = [NSURL URLWithString:@"app://ga/ecommerce/%7B%22product%22:%22playstation4%22..."];
    NSString *last = [url lastPathComponent];

Upvotes: 7

Nitin Gohel
Nitin Gohel

Reputation: 49720

You may split string in array and get last object from array like following:

NSString *myString = @"app://ga/ecommerce/product:playstation4"; 
NSArray* spliteArray = [myString componentsSeparatedByString: @"/"];
NSString* lastString = [spliteArray lastObject];

Upvotes: 2

kfairns
kfairns

Reputation: 3057

The regex you need is something like this:

((\/){1}([a-z\-]*))$

Which will match 1 slash, with all lowercase letters and hyphens. You can add more characters in there, like A-Z for capital letters (etc), and the '$' places matches it from the end of the string,

Upvotes: 0

gnasher729
gnasher729

Reputation: 52538

Create an NSURL and use the NSURL methods, like lastPathComponent, or parameterString. These methods are presumably written by someone who knows how to handle URLs.

Upvotes: 2

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