Question

In my textfield it should allow both positive and negative decimal values. So I used the regex

#define FLOAT_REGEX @"-[0-9]+(\.[0-9][0-9]?)?"

-(BOOL) checkForDecimalValue:(NSString *) string
{
NSPredicate *confidenceTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",FLOAT_REGEX]; 
return [confidenceTest evaluateWithObject:string]?YES:NO;
}

But it is not accepted if I enter only positive values without any decimal point (for ex 100,200, etc). It should allow positive values and integer also.

Answer 1

replace the line use the following:

#define FLOAT_REGEX @"^[-]?[0-9]*(.[0-9]*)?$"

Hope this helps in what you want. Check its validity from here