On Thu, Feb 5, 2009 at 4:16 PM, Shawn Erickson <shaw...@gmail.com> wrote:
> On Thu, Feb 5, 2009 at 3:39 PM, harry greenmonster
> <southwestmons...@googlemail.com> wrote:
>
>> 'inputString' is a 5mb text file,
>
> Since inputString is large you really should avoid causing it to be
> copied over and over again which -[NSString
> stringByReplacingCharactersInRange:withString:] is doing. You should
> instead use a mutable string and -[NSMutableString
> replaceCharactersInRange:withString:].
>
> NSMutableString* tmpString = [[inputString mutableCopy] autorelease];
> while([tmpString isMatchedByRegex:regexString]) {
> range = [tmpString rangeOfRegex:regexString];
> [tmpString replaceCharactersInRange:range withString:@""];
> }
...better yet use -[NSMutableString deleteCharactersInRange:] given
you are replacing with an empty string.
-Shawn
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