Regular expressions in Objective-C

main.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        NSString *key = @"UINavigationBarTintColor";
        NSString *pattern = @"(Color|Font|Height|Width|Size|Origin|Frame)$";

        NSError *error = nil;
        NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];

        if (regex) {

            // Regular expression pattern is valid, let's check if we can find a match in the string.
            NSTextCheckingResult *match = [regex firstMatchInString:key options:0 range:NSMakeRange(0, [key length])];
            NSString *matchString = [key substringWithRange:match.range];
            NSLog(@"matchString: %@", matchString);        
        }
        
    }
    return 0;
}