Remove punctuation characters from string except for dash in Swift

Question

I have some code to remove all punctuation characters:

mysentence.components(separatedBy: .punctuationCharacters).joined().components(separatedBy: " ")

Now, I am trying to add an exception for the dash character "-". In other words, I want to remove all punctuation EXCEPT for dashes.

It looks like in Java this can be done with replaceall using a regular expression (which admittedly I don't know how to use). How might I do this in Swift 4?

A character set is a set. Making a set derived from the punctuation characters set but without the dash is trivial. — matt, Aug 15 '18 at 13:12
Thank's Matt. Are you suggesting I just replace .punctuationCharacters with my own custom set? — Coltuxumab, Aug 15 '18 at 13:15
Possibly helpful: https://stackoverflow.com/q/40702492/1187415 (which accidentally is also about the punctuation character set and the dash). — Martin R, Aug 15 '18 at 13:22
@adev You're right, very similar. However that was apparently before a Swift bug was patched and mine appears to now be post-patch because Hossam's answer below is working well for me. — Coltuxumab, Aug 16 '18 at 12:04

score 4 · Accepted Answer · answered Aug 15 '18 at 21:26

4

Maybe you remove dash - from CharacterSet like:

var set = CharacterSet.punctuationCharacters
set.remove(charactersIn: "-")

answered Aug 15 '18 at 21:26

Hossam Ghareeb

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Remove punctuation characters from string except for dash in Swift

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