ios - Removing multiple spaces in NSString

Question

I have a NSString, this has multiple spaces, I want to trim those spaces and make a single space for e.g.@"how.....are.......you" into @"how are you".(dots are simply spaces)

I have tried with

NSString *trimmedString = [user_ids stringByTrimmingCharactersInSet:
                           [NSCharacterSet whitespaceCharacterSet]];

It not seems to work. Any idea.

Answer 1

You could use a regular expression to accomplish this:

NSError *error = nil;

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"  +" options:NSRegularExpressionCaseInsensitive error:&error];

The pattern is a space followed by one or more occurrences of space. Replace this with a single space in your string:

NSString *trimmedString = [regex stringByReplacingMatchesInString:user_ids options:0 range:NSMakeRange(0, [user_ids length]) withTemplate:@" "];