iOS the best way to "clean" a string?

P

patrover

macrumors newbie

Original poster

• Sep 7, 2009

• #1

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

Moderator emeritus

• Sep 7, 2009

• #2

Have you looked through the NSString Class Reference or the String Programming Guide for Cocoa?

 

MacDonaldsd

macrumors 65816

• Sep 7, 2009

• #3

dejo said:

Have you looked through the NSString Class Reference or the String Programming Guide for Cocoa?

Click to expand...

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

Code:

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

 

PhoneyDeveloper

macrumors 68040

• Sep 7, 2009

• #4

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

Moderator emeritus

• Sep 7, 2009

• #5

PhoneyDeveloper said:

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

Click to expand...

Just curious: why do you say this?

 

P

patrover

macrumors newbie

Original poster

• Sep 8, 2009

• #6

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

 

dejo

Moderator emeritus

• Sep 8, 2009

• #7

patrover said:

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

Click to expand...

Ah, that's right. Perhaps one of the stringByReplacing... methods will suit your needs.

 

R

RaceTripper

macrumors 68030

• Sep 8, 2009

• #8

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

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