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I have a very big NSString, which holds around 1500 characters in it. In this string I need to extract a phone number, which may change frequently, as it is a dynamic data. The phone number will be in the format of 251-221-2000, how can I extract this?
Check out this previous question on regular expressions and
NSString.Search through NSString using Regular Expression
In your case an appropriate regular expression would be
@"\\d{3}-\\d{3}-\\d{4}".