Cannot assign regex string in objective-c

Question

I'm having issue assigning regex value to a string. Issue that I have is I have \d in the string value and objective-c complaining!

Here is my code

I'm assigning regex value here.

- (BOOL) validateUSZipCode: (NSString *) candidate {
   NSString *regex = @"^\d{5}(-\d{4})?$"; 
   NSPredicate *test = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; 

   return [test evaluateWithObject:candidate];
}

Someone help me please!

What do you mean by "complaining?"

Rob Napier
– Rob Napier

2011-10-20 16:52:19 +00:00
Commented Oct 20, 2011 at 16:52 — Rob Napier
– Rob Napier, Commented Oct 20, 2011 at 16:52
it warns me: Unknown escape sequence '\d'

HardCode
– HardCode

2011-10-20 16:55:27 +00:00
Commented Oct 20, 2011 at 16:55 — HardCode
– HardCode, Commented Oct 20, 2011 at 16:55

Rob Napier · Accepted Answer · 2011-10-20 17:09:04Z

2

You need to quote backslashes to include them in a constant NSString.

NSString *regex = @"^\\d{5}(-\\d{4})?$";

answered Oct 20, 2011 at 17:09

Rob Napier

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