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On 9/12/11 7:01 AM, Devraj Mukherjee wrote:
> Hi all,
> 
> I am trying to use NSScanner to change camel cased strings into 
> underscore delimited strings, e.g featuredListingId to 
> featured_listing_id

In addition to the responses you have already received, if you are
using a sufficiently new SDK you can use regexes to accomplish your goal:



NSString *input = @"featuredListingId";

NSError *error = nil;

NSRegularExpression *regex = [NSRegularExpression
regularExpressionWithPattern:@"([a-z])([A-Z])" options:0 error:&error];

NSString *result = [[regex stringByReplacingMatchesInString:input
options:0 range:NSMakeRange(0, [input length]) withTemplate:@"$1_$2"]
lowercaseString];



(Clearly you would need to handle errors, etc., as appropriate for
your situation.)

Regular expressions typically run slowly in relative terms, so if you
are doing a lot of these conversions you would probably want to
profile performance too.


- -- 
Conrad Shultz

Synthetiq Solutions
www.synthetiqsolutions.com

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