in objective c i want to replace string which is between two string.
For example "ab anystring yz"
i want to replace string which is between "ab" and "yz".
is it possible to do? Please Help
thx in advance.
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3 Answers
Here is tested code to perform your task.
NSString *string = @"ab anystring yz";
NSString *result = nil;
// Determine "ab" location
NSRange divRange = [string rangeOfString:@"ab" options:NSCaseInsensitiveSearch];
if (divRange.location != NSNotFound)
{
// Determine "ab" location according to "yz" location
NSRange endDivRange;
endDivRange.location = divRange.length + divRange.location;
endDivRange.length = [string length] - endDivRange.location;
endDivRange = [string rangeOfString:@"yz" options:NSCaseInsensitiveSearch range:endDivRange];
if (endDivRange.location != NSNotFound)
{
// Tags found: retrieve string between them
divRange.location += divRange.length;
divRange.length = endDivRange.location - divRange.location;
result = [string substringWithRange:divRange];
string =[string stringByReplacingCharactersInRange:divRange withString:@"Replace string"];
}
}
Now you just check the string you will get ab Replace string yz
Comments
NSString *newString = [(NSString *)yourOldString stringByReplacingOccurrencesOfString:@"anystring" withString:@""];
otherwise you're going to have to get a copy of REGEXKitLite and use a regex function like:
NSString *newString = [(NSString *)yourOldString stringByReplacingOccurrencesOfRegex:@"ab\\b.\\byz" withString:@"ab yz"];
5 Comments
Viral Narshana
Thanks Thomas.I tried first one but it doesn't work.I am not clear about second answer.In my case string between "ab" and "yz" is not fixed length string.help me if is it possible.
Thomas Clayson
afaik a fullstop
. in regex means "any amount of characters". You need to download regexKitLite and include it in your project.Viral Narshana
Hi Thomas Thanks again. I tried it.No compilation error but might be some logic error.I put the code.Tell me if u have any suggestion for it. NSString *str = [[NSString alloc] init]; str = @"ab This is demo yz"; NSString *newstr = [[NSString alloc] init]; newstr = [str stringByReplacingOccurrencesOfRegex:@"ab\\b.\\byz" withString:@"good"];
Viral Narshana
I got the answer. NSString str = [[NSString alloc] init]; str = @"ab this is demo yz"; NSString *newstr = [[NSString alloc] init]; newstr = [str stringByReplacingOccurrencesOfRegex:@" (.) " withString:@"good"];
Thomas Clayson
May I suggest that instead of doing
NSString *str = [[NSString alloc] init]; str= @"Hello"; You can just do: NSString *str = [NSString stringWithFormat:@"Hello"]; then you don't have to worry about memory management or anything. :) and its just a little nicer to code and read. :) -(NSString*)StrReplace :(NSString*)mainString preMatch:(NSString*) preMatch postMatch:(NSString*) postMatch replacementString:(NSString*) replacementString
{
@try
{
if (![mainString isEqualToString:@""] || [mainString isKindOfClass:[NSNull class]] || mainString==nil)
{
NSArray *preSubstring = [mainString componentsSeparatedByString:preMatch];
NSString *preStr = [preSubstring objectAtIndex:0];
NSArray *postSubstring = [mainString componentsSeparatedByString:postMatch];
NSString *postStr = [postSubstring objectAtIndex:1];
NSString *resultStr = [NSString stringWithFormat:@"%@%@%@%@%@" ,preStr,preMatch,replacementString,postMatch,postStr];
return resultStr;
}
else
{
return @"";
}
}
@catch (NSException *exception) {
}
}
1 Comment
Nander Speerstra
Please edit your question: (i) add an explanation to your code (just code is not an answer to an 'is it possible' question) and (ii) fix your code block (since not all code is in the code block).