Convert number to phone format using regular expression - iphone

Question

My problem is that I have some text field with number and I must to convert this number to some phone format like this one (xxx) xxx-xxxx. I have tried an regular expression with this code:
wholeText = [wholeText stringByReplacingOccurrencesOfString:#"(\\d{1,3})(\\d{0,3})(\\d{0,4})"
withString:#"($1) $2-$3"
options:NSRegularExpressionSearch
range:NSMakeRange(0, wholeText.length)];
NSLog(#"wholeText = %#", wholeText);
If I gradually enter a text in text field, NSLog output this:
wholeText = (1) -
wholeText = (12) -
wholeText = (123) -
wholeText = (123) 4-
wholeText = (123) 45-
wholeText = (123) 456-
wholeText = (123) 456-7
So my problem that I do not need brackets and hyphens if there is no number before it, i.e. closing bracket should appear after I enter 4th number and hyphen should appear after I enter 7th number.

Answer 1

Use this Utility
UITextField subclass that allows number input in a predefined format.
http://www.cocoacontrols.com/controls/reformattednumberfield

Answer 2

If you have access to lazy operators, this will do what you want (I guess, you didn't give that much details.):
/^(\d{1,3}?)(\d{1,3}?)(\d{1,4})$/
How? Lazy operators.

Answer 3

use below code
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
int length = [self getLength:textField.text];
//NSLog(#"Length = %d ",length);
if(length == 10)
{
if(range.length == 0)
return NO;
}
NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
NSCharacterSet *charactersToRemove = [[ NSCharacterSet alphanumericCharacterSet ] invertedSet ];
newString = [[newString componentsSeparatedByCharactersInSet:charactersToRemove]componentsJoinedByString:#""];
NSString *expression = #"^([0-9]+)?(\\.([0-9]{1,2})?)?$";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:expression
options:NSRegularExpressionCaseInsensitive
error:nil];
NSUInteger numberOfMatches = [regex numberOfMatchesInString:newString
options:0
range:NSMakeRange(0, [newString length])];
NSLog(#"newString::%#",newString);
if (numberOfMatches == 0)
return NO;
if(length == 3)
{
NSString *num = [self formatNumber:textField.text];
textField.text = [NSString stringWithFormat:#"(%#)",num];
if(range.length > 0)
textField.text = [NSString stringWithFormat:#"%#",[num substringToIndex:3]];
}
else if(length == 6)
{
NSString *num = [self formatNumber:textField.text];
//NSLog(#"%#",[num substringToIndex:3]);
//NSLog(#"%#",[num substringFromIndex:3]);
textField.text = [NSString stringWithFormat:#"(%#) %#-",[num substringToIndex:3],[num substringFromIndex:3]];
if(range.length > 0)
textField.text = [NSString stringWithFormat:#"(%#) %#",[num substringToIndex:3],[num substringFromIndex:3]];
}
return YES;
}
#pragma mark - Mobile Validation
-(NSString*)formatNumber:(NSString*)mobileNumber
{
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#"(" withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#")" withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#" " withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#"-" withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#"+" withString:#""];
NSLog(#"%#", mobileNumber);
int length = [mobileNumber length];
if(length > 10)
{
mobileNumber = [mobileNumber substringFromIndex: length-10];
NSLog(#"%#", mobileNumber);
}
return mobileNumber;
}
-(int)getLength:(NSString*)mobileNumber
{
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#"(" withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#")" withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#" " withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#"-" withString:#""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:#"+" withString:#""];
int length = [mobileNumber length];
return length;
}
try this you will be succeed