nsstring replace string in range - iphone

Question

I have a string with certain pattern. I need to search for the pattern and replace the string inside that pattern. For eg :
NSString *string = #"{Hello} ({World}) ({How}) ({Are}) ({You})";
NSString *result = nil;
// Determine "{" location
NSRange startRange = [string rangeOfString:#"{" options:NSCaseInsensitiveSearch];
if (startRange.location != NSNotFound)
{
// Determine "}" location according to "{" location
NSRange endRange;
endRange.location = startRange.length + startRange.location;
endRange.length = [string length] - endRange.location;
endRange = [string rangeOfString:#"}" options:NSCaseInsensitiveSearch range:endRange];
if (endRange.location != NSNotFound)
{
// bracets found: retrieve string between them
startRange.location += startRange.length;
startRange.length = endRange.location - startRange.location;
result = [string substringWithRange:startRange];
}
}
Here I am able to extract the first substring that is between "{ }" ie - "Hello" but I also need to continue the check and want to extract other strings.

Answer 1

Try this one:
NSString *string = #"{Hello} ({World}) ({How}) ({Are}) ({You})";
//NSString *result = nil;
// Determine "{" location
NSArray *array=[string componentsSeparatedByString:#"{"];
for(NSString *str in array){
NSString *newString=[[str componentsSeparatedByString:#"}"] objectAtIndex:0];
NSLog(#"%#",newString);
}

Answer 2

try this :
NSString *string = #"{Hello} ({World}) ({How}) ({Are}) ({You})";
NSMutableString *result = [[NSMutableString alloc] init];
NSArray *tempArray = [[string componentsSeparatedByString:#" "] mutableCopy];
for (int i=0; i < [tempArray count]; i++)
{
NSString *tempStr = [tempArray objectAtIndex:i];
NSRange startRange = [tempStr rangeOfString:#"{" options:NSCaseInsensitiveSearch];
if (startRange.location != NSNotFound)
{
// Determine "}" location according to "{" location
NSRange endRange;
endRange.location = startRange.length + startRange.location;
endRange.length = [tempStr length] - endRange.location;
endRange = [tempStr rangeOfString:#"}" options:NSCaseInsensitiveSearch range:endRange];
if (endRange.location != NSNotFound)
{
// bracets found: retrieve string between them
startRange.location += startRange.length;
startRange.length = endRange.location - startRange.location;
//result = [tempStr substringWithRange:startRange];
[result appendString:[NSString stringWithFormat:#"%# ",[tempStr substringWithRange:startRange]]];
NSLog(#"%# ",result);
}
}
}
Take care for release for tempArray and result

Answer 3

I happen to have this code lying around. I think it does exactly what you want. I implemented it as a category on NSString. You use it like this:
NSString *template = #"{Hello} ({World}) ({How}) etc etc";
NSDictionary *vars = [NSDictionary dictionaryWithObjectsAndKeys:
#"Bonjour", #"Hello",
#"Planet Earth", #"World",
#"Como", #"How",
// etc.
nil];
NSString *expandedString = [template stringByExpandingTemplateWithVariables:vars];
// expandedString is #"Bonjour (Planet Earth) (Como) etc etc"
Here's the code.
File NSString+TemplateExpansion.h
#import <Foundation/Foundation.h>
#interface NSString (TemplateExpansion)
- (NSString *)stringByExpandingTemplateWithVariables:(NSDictionary *)dictionary;
#end
File NSString+TemplateExpansion.m
#import "NSString+TemplateExpansion.h"
#implementation NSString (TemplateExpansion)
- (NSString *)stringByExpandingTemplateWithVariables:(NSDictionary *)dictionary
{
NSUInteger myLength = self.length;
NSMutableString *result = [NSMutableString stringWithCapacity:myLength];
NSRange remainingRange = NSMakeRange(0, myLength);
while (remainingRange.length > 0) {
NSRange leftBraceRange = [self rangeOfString:#"{" options:0 range:remainingRange];
if (leftBraceRange.location == NSNotFound)
break;
NSRange afterLeftBraceRange = NSMakeRange(NSMaxRange(leftBraceRange), myLength - NSMaxRange(leftBraceRange));
NSRange rightBraceRange = [self rangeOfString:#"}" options:0 range:afterLeftBraceRange];
if (rightBraceRange.location == NSNotFound)
break;
NSRange beforeLeftBraceRange = NSMakeRange(remainingRange.location, leftBraceRange.location - remainingRange.location);
[result appendString:[self substringWithRange:beforeLeftBraceRange]];
remainingRange = NSMakeRange(NSMaxRange(rightBraceRange), myLength - NSMaxRange(rightBraceRange));
NSRange keyRange = NSMakeRange(NSMaxRange(leftBraceRange), rightBraceRange.location - NSMaxRange(leftBraceRange));
NSString *key = [self substringWithRange:keyRange];
NSString *value = [dictionary objectForKey:key];
if (value)
[result appendString:value];
}
[result appendString:[self substringWithRange:remainingRange]];
return result;
}
#end