CODEWITHSUNDEEP
iosswiftstring
Nazmul Hasan
Nazmul Hasan

Reputation: 10590

How to get a String Contains number of Exact Sentence / Word in swift 4?

I looking for in my string exact number of word/sentence for example:
What i am tried:

let str = "Art of swift, now art of swift5 but this is true art of swift from 2014 now what do you think about art of swift?"
var search = "art of swift"

str.contains(word:search)
var count = str.lowercased().components(separatedBy: search.lowercased()).count
print(count - 1)

output:

  4

I am looking for it should be 3 because of art of swift5 not looking for search.

In the example above, it returns 4 because of found "art of swift" in the word "art of swift5". I want a method that will return 3 in that condition.

But method have more few case:

Allow
case-insensitive for user can be upper case or lower it doesn't matter for search result counter. example user put Art of swift in the text string has art of swift 

 Art of swift // it will return true as found 1

any special character allow for example ? , . etc 

art of swift? // it will return true as found 1

even special character with character allow for example ` 

art of swift's // it will return true as found 1

Don't allow:
don't allowing different language character for example

art of swiftবাং // it will return false as not found 0

even it not allowing same language character 

art of swiftly // it will return false as not found 0

Why need it?

i am trying to implement search result items show it base on best match priority.

Upvotes: 1

Views: 527

Answers (1)

rob mayoff
rob mayoff

Reputation: 385700

import Foundation

extension String {
    func nazmulCount(of needle: String) -> Int {
        let pattern = "\\b" + NSRegularExpression.escapedPattern(for: needle) + "\\b"
        let rex = try! NSRegularExpression(pattern: pattern, options: [.caseInsensitive])
        return rex.matches(in: self, options: [], range: NSRange(startIndex..., in: self)).count
    }
}

"Art of swift, now art of swift5 but this is true art of swift from 2014 now what do you think about art of swift?".nazmulCount(of: "art of swift")
// 3

"Art of swift".nazmulCount(of: "art of swift")
// 1

"art of swift?".nazmulCount(of: "art of swift")
// 1

"art of swift's".nazmulCount(of: "art of swift")
// 1

"art of swiftবাং".nazmulCount(of: "art of swift")
// 0

"art of swiftly".nazmulCount(of: "art of swift")
// 0

Upvotes: 2

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