Excluding strings from one string using Regex in iOS

Question

I want to do pretty much the same as in Excluding strings using regex but I want to do it iOS using Regex. So I basically I want to find matches in a string and then remove them from the string so if I have a string like this, Hello #world @something I want to find #world & @something and then remove them from the string so it just becomes Hello. I already have this expression that removes #world and something but not the @, #[\\p{Letter}]+|[^@]+$ I solved the @ problem by doing this

NSString *stringWithoutAt = [input stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"@%@",atString] withString:@""];
NSString *stringWithoutTag = [input stringByReplacingOccurrencesOfString:tagString withString:@""];

So for the first one I end up with Hello #world and the second one Hello @something. But is there a way of using Regex or something else to remove both the #world and the @something at the same time?

Abhishek Singh · Accepted Answer · 2012-05-16 15:05:37Z

2

You can use regex in iPhone in two ways:-

1>Using RegExKitLIte as framework see the tutorial

2>Using NSRegularExpression & NSTextCheckingResult

NSStirng *string=@"Your String";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"@[a-z]*#[a-z]*" options:NSRegularExpressionCaseInsensitive error:&error];
[regex enumerateMatchesInString:string options:0 range:NSMakeRange(0, [string length]) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop)
{
    // your statement if it matches
}];

Here any expression after@ and expression after # is being concatenated

and in the statement you can replace it by space to get your expression

if u simply want modified string do this :-

 NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0
range:NSMakeRange(0, [string length]) withTemplate:@"$2$1"];

edited May 16, 2012 at 15:05

answered May 13, 2012 at 16:48

Abhishek Singh

6,1761 gold badge26 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Souljacker Over a year ago

Sorry but can you explain exactly what you are doing?

Souljacker Over a year ago

Is there any way apart from using Regex to do this?

Abhishek Singh Over a year ago

I have written a regex expression that matches an expression @[letters]#[letters]and then you can replace it with @" ".in the block i provided.

Abhishek Singh Over a year ago

There are other ways such as find the @ sign in your string and taking it's position remove every character after it using substring method.

Souljacker Over a year ago

I found out a simpler solution,

NSString *stringWithoutAnything = [string stringByReplacingOccurrencesOfRegex:[NSString stringWithFormat:@"%@ @%@",tagString,atString] withString:@""];

Collectives™ on Stack Overflow

Excluding strings from one string using Regex in iOS

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related