How do i remove a substring from an nsstring? - iphone

Question

Ok, say I have the string "hello my name is donald"
Now, I want to remove everything from "hello" to "is"
The thing is, "my name" could be anything, it could also be "his son"
So basically, simply doing stringByReplacingOccurrencesOfString won't work.
(I do have RegexLite)
How would I do this?

Answer 1

Use like below it will help you
NSString *hello = #"his is name is isName";
NSRange rangeSpace = [hello rangeOfString:#" "
options:NSBackwardsSearch];
NSRange isRange = [hello rangeOfString:#"is"
options:NSBackwardsSearch
range:NSMakeRange(0, rangeSpace.location)];
NSString *finalResult = [NSString stringWithFormat:#"%# %#",[hello substringToIndex:[hello rangeOfString:#" "].location],[hello substringFromIndex:isRange.location]];
NSLog(#"finalResult----%#",finalResult);

Answer 2

The following NSString Category may help you. It works good for me but not created by me. Thanks for the author.
NSString+Whitespace.h
#import <Foundation/Foundation.h>
#interface NSString (Whitespace)
- (NSString *)stringByCompressingWhitespaceTo:(NSString *)seperator;
#end
NSString+Whitespace.m
#
import "NSString+Whitespace.h"
#implementation NSString (Whitespace)
- (NSString *)stringByCompressingWhitespaceTo:(NSString *)seperator
{
//NSArray *comps = [self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSArray *comps = [self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSMutableArray *nonemptyComps = [[NSMutableArray alloc] init];
// only copy non-empty entries
for (NSString *oneComp in comps)
{
if (![oneComp isEqualToString:#""])
{
[nonemptyComps addObject:oneComp];
}
}
return [nonemptyComps componentsJoinedByString:seperator]; // already marked as autoreleased
}
#end

Answer 3

If you always know your string will begin with 'hello my name is ', then that is 17 characters, including the final space, so if you
NSString * hello = "hello my name is Donald Trump";
NSString * finalNameOnly = [hello substringFromIndex:17];