iphone - Convert number to phone format using regular expression -

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my problem have text field number , must convert number phone format 1 (xxx) xxx-xxxx. have tried regular expression 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 gradually enter 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 problem do not need brackets , hyphens if there no number before it, i.e. closing bracket should appear after enter 4th number , hyphen should appear after enter 7th number.

use utility

enter image description here

uitextfield subclass allows number input in predefined format.

http://www.cocoacontrols.com/controls/reformattednumberfield


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