CODEWITHSUNDEEP
iosregexnsregularexpression
Exlinct
Exlinct

Reputation: 11

NSRegularExpression search string "*string*"

i have a list of string i want search string like A mean it is only appearance in middle not first or last.My code here: When i run all 3 case is true, but only case "う上あ" is true

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    NSArray *array = @[@"上あう", @"う上あ", @"あう上"];
    NSString *stringNeedToFind = @"*上*";
    for (NSString *string in array) {
        if ([[self regularExpressionFromValue: stringNeedToFind] numberOfMatchesInString:string options: 0 range: NSMakeRange(0, string.length)]) {
            NSLog(@"String containt.");
        }
    }
}

- (NSRegularExpression *) regularExpressionFromValue: (NSString *) value
{
    NSString *pattern = [NSRegularExpression escapedPatternForString: value];
    pattern = [pattern stringByReplacingOccurrencesOfString: @"\\*" withString: @".*"];
    pattern = [pattern stringByReplacingOccurrencesOfString: @"\\?" withString: @"."];
    pattern = [pattern stringByReplacingOccurrencesOfString: @".*.*.*" withString: @"\\*"];
    pattern = [pattern stringByReplacingOccurrencesOfString: @"..." withString: @"\\?\\?\\?"];
    pattern = [NSString stringWithFormat: @"^%@$", pattern];
    return [NSRegularExpression regularExpressionWithPattern: pattern options: 0 error: NULL];
}

Upvotes: 1

Views: 230

Answers (1)

Paul van Roosendaal
Paul van Roosendaal

Reputation: 1434

As far as I know, the asterisk (*) is used as an operator to check if a character (set) is present 0 or more times. I think you should use the plus character (+), e.g. like this: ^.+上.+$, meaning there should be 1 or more characters at the start and at the end.

Upvotes: 1

Related Questions