the best way to "clean" a string?

[patrover]

i have a string: (2434)-45455

and i want to filter out all the non-numeric chars ( i.e "()-" ), what is the best way?


thanks

[dejo]

Have you looked through the NSString Class Reference (http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html) or the String Programming Guide for Cocoa (http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Strings/introStrings.html)?

[MacDonaldsd]

Have you looked through the NSString Class Reference (http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html) or the String Programming Guide for Cocoa (http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Strings/introStrings.html)?

Thats obviously the best place to start. If you read through them you will find.

- (NSString *)stringByTrimmingCharactersInSet:(NSCharacterSet *)set;

[PhoneyDeveloper]

stringByTrimmingCharactersInSet: probably won't be useful for this purpose.

Look at the string programming guide, as suggested. Also look at NSScanner. If you prefer regular expressions you could look into that as well.

[dejo]

stringByTrimmingCharactersInSet: probably won't be useful for this purpose.
Just curious: why do you say this?

[patrover]

if i'm not mistaken trimming is only for the edges of the string.

[dejo]

if i'm not mistaken trimming is only for the edges of the string.
Ah, that's right. Perhaps one of the stringByReplacing... methods will suit your needs.

[RaceTripper]

Can you use regex? Use that to replace all [^\d] with the empty string.

In perl it would be: s/[^\d]//g