How to check the validity of a GUID (or UUID) using NSRegularExpression or any other effective way in Objective-C

Question

The method should return TRUE if the NSString is something like @\"{A5B8A206-E14D-429B-BEB0-2DD0575F3BC0}\" and FALSE for a NSString like @\"bla bla bla\"

I am using

Answer 1

Consider the shortened UUID format. Use code below:

-（BOOL)isValidUUID:(NSString*)uuidString{   
NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:uuidString];
if (uuid ) {
    return YES;
}

NSError *error;
NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:@"[^0-9|^a-f]" options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *matches = [reg matchesInString:uuidString options:NSMatchingReportCompletion range:NSMakeRange(0, uuidString.length)];

if (matches.count == 0 && (uuidString.length == 4 || uuidString.length ==8) ) {
    return YES;
}else{
    return NO;
}
}