Objective-C regex

objc-regex

NSString* pattern = @"^(\\d{3})$";

NSError* error = nil;
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
NSString* text =  @"122";
NSArray *matches = [regex matchesInString:text options:0 range:NSMakeRange(0, text.length)];

if(matches.count>0){
	NSLog(@"%@",matches);
}else{
	NSLog(@"Not match!");
}