Remove last punctuation of a swift string

Question

I'm trying to remove the last punctuation of a string in swift 2.0

var str: String = "This is a string, but i need to remove this comma,      \n"
var trimmedstr: String = str.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())

First I'm removing the the white spaces and newline characters at the end, and then I need to check of the last character of trimmedstr if it is a punctuation. It can be a period, comma, dash, etc, and if it is i need to remove it it.

How can i accomplish this?

vacawama · Accepted Answer · 2022-09-13T12:35:36.003

10

There are multiple ways to do it. You can use contains to check if the last character is in the set of expected characters, and use dropLast() on the String to construct a new string without the last character:

let str = "This is a string, but i need to remove this comma, \n"

let trimmedstr = str.trimmingCharacters(in: .whitespacesAndNewlines)

if let lastchar = trimmedstr.last {
    if [",", ".", "-", "?"].contains(lastchar) {
        let newstr = String(trimmedstr.dropLast())
        print(newstr)
    }
}

edited Sep 13 '22 at 12:35

answered Jan 01 '16 at 01:57

vacawama

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Thank you so much, that fixed my problem! – Vitalik K Jan 17 '16 at 00:39
You're welcome @VitalikK. Please click the checkmark to the left of my answer to turn it green. – vacawama Jan 17 '16 at 01:04
Got it, i'm just new to stack overflow – Vitalik K Jan 17 '16 at 01:09
would you by any chance know how to initialize this Dictionary: `var songs = [String: [song]]()` where song is a structure – Vitalik K Jan 17 '16 at 01:12
That is initialized. Song should be capitalized as a struct name. Post a new question with your structure and the data you want to put in your dictionary. – vacawama Jan 17 '16 at 01:16
I posted it under "How to initialize a Dictionary with structure components in Swift" – Vitalik K Jan 17 '16 at 01:28

score 3 · Answer 2 · answered Mar 08 '18 at 18:59

Could use .trimmingCharacters(in:.whitespacesAndNewlines) and .trimmingCharacters(in: .punctuationCharacters)

for example, to remove whitespaces and punctuations on both ends of the String-

let str = "\n This is a string, but i need to remove this comma and whitespaces, \t\n"

let trimmedStr = str.trimmingCharacters(in: .whitespacesAndNewlines).trimmingCharacters(in: .punctuationCharacters)

Result -

This is a string, but i need to remove this comma and whitespaces

Remove last punctuation of a swift string

2 Answers2