nsstring replace string in range

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.

halfer · Accepted Answer · 2019-03-03 09:17:33Z

2

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);
    }

edited Mar 3, 2019 at 9:17

halfer

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answered Dec 12, 2011 at 7:30

Rahul Juyal

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Comments

Maulik · Accepted Answer · 2011-12-12 07:49:15Z

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

rob mayoff · Accepted Answer · 2011-12-12 07:58:54Z

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

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