CODEWITHSUNDEEP
objective-csubstringnsstring
Jim
Jim

Reputation: 9234

Find one string in another with case insensitive in Objective-C

My question is similar to How do I check if a string contains another string in Objective-C?

How can I check if a string (NSString) contains another smaller string but with ignoring case?

NSString *string = @"hello bla bla";

I was hoping for something like:

NSLog(@"%d",[string containsSubstring:@"BLA"]);

Anyway is there any way to find if a string contains another string with ignore case ? But please do not convert both strings to UpperCase or to LowerCase.

Upvotes: 34

Views: 19150

Answers (6)

Md. Ibrahim Hassan
Md. Ibrahim Hassan

Reputation: 5467

For Swift 4:

extension String {
    func containsCaseInsensitive(string : String) -> Bool {
        return self.localizedCaseInsensitiveContains(string)
    }
}

Usage:

print("Hello".containsCaseInsensitive(string: "LLO"))

Output:

true

Upvotes: 0

Ilanchezhian
Ilanchezhian

Reputation: 17478

As similar to the answer provided in the link, but use options.

See - (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask in Apple doc

NSString *string = @"hello bla bla";

if ([string rangeOfString:@"BLA" options:NSCaseInsensitiveSearch].location == NSNotFound)
{
    NSLog(@"string does not contain bla");
} 
else 
{
    NSLog(@"string contains bla!");
}

Upvotes: 87

ajay_nasa
ajay_nasa

Reputation: 2298

From iOS 8 you can add the containsString: or localizedCaseInsensitiveContainsString method to NSString.

if ([string localizedCaseInsensitiveContainsString:@"BlA"]) {
    NSLog(@"string contains Case Insensitive bla!");
} else {
    NSLog(@"string does not contain bla");
}

Upvotes: 17

user971401
user971401

Reputation:

You can use -(NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask; to get a range for a substring, the mask parameter is used to specify case insensitive match.

Example : 

NSRange r = [str rangeOfString:@"BLA"
                       options:NSCaseInsensitiveSearch];

As stated in the documentation, the method returns a range like {NSNotFound, 0} when the substring isn't found.

BOOL b = r.location == NSNotFound;

Important this method raises an exception if the string is nil.

Upvotes: 0

Inder Kumar Rathore
Inder Kumar Rathore

Reputation: 39988

NSString *string = @"hello BLA";
if ([string rangeOfString:@"bla" options:NSCaseInsensitiveSearch].location == NSNotFound) {
    NSLog(@"string does not contain bla");
} else {
    NSLog(@"string contains bla!");
}

Upvotes: 3

Pierre
Pierre

Reputation: 2019

The method

[string rangeOfString:@"bla" options:NSCaseInsensitiveSearch];

should help you.

Upvotes: 0

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