Question

Can someone give me NSPredicate for validating string which are of the form:
1. Atleast one digit (0-9)
2. Followed by one or none of “.(0-9)”

So basically I want string like this to be valid:

2.34
84
1.0
2314234
3214.23123

Thanks.

Answer 1

One way to do this is:

NSString *predicateString = @"[0-9]+\\.[0-9]$"; 
NSPredicate *numberTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", predicateString]; 
BOOL isNumber = [numberTest evaluateWithObject:string];

Instead of using NSPredicate, you can use the NSScanner method - (BOOL)scanFloat:(float *)floatValue.