Re: NSScanner to find multiple occurrences of a prefix?
Re: NSScanner to find multiple occurrences of a prefix?
- Subject: Re: NSScanner to find multiple occurrences of a prefix?
- From: Conrad Shultz <email@hidden>
- Date: Mon, 12 Sep 2011 16:39:37 -0700
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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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