Question

I need to validate first and last name from Credit card.
For example: “Lange Norton” or “LANGE NORTON”
I use this code:

NSString *nameRegex = @"^[A-Z][a-z]*[\pL\pM\p{Nl}][A-Z][a-z]*$"; 
NSPredicate *nameTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", nameRegex]; 
return [nameTest evaluateWithObject:nameSurname];

And I have a problem with whitespace.
“Unknown escape sequence ‘\p'”
What should I do?

Answer 1

I think you missed some curly brackets

NSString *nameRegex = @"^[A-Z][a-z]*[\p{L}\p{M}\p{Nl}][A-Z][a-z]*$";

if you also need whitspace add \s

You can find a list of those properties (the \p{L}\p{M}\p{Nl} stuff) here on regular-expressions.info

\p{L} or \p{Letter}: any kind of letter from any language

\p{M} or \p{Mark}: a character intended to be combined with another
character (e.g. accents, umlauts, enclosing boxes, etc.).

\p{Nl} or \p{Letter_Number}: a number that looks like a letter, such
as a Roman numeral.

Additionally I don’t think your expression is correct.

Your string needs to start with [A-Z] followed by [a-z]* (can also be zero) and then only one of those [\p{L}\p{M}\p{Nl}] another uppercase ASCII letter followed by lowercase letters.

What happens if the persons name is “René Müller”?