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iosobjective-cxcodeios7

In iOS how to check string against regular expression with boolean result

In iOS I need to check string against regular expression and if it passes then to return true (for example), if not false. I understand that I have to use NSRegularExpression class, but I can not figure out how.

Solution

  • You should read documentation.

    Here is an example code how to do this in general:

    - (BOOL)checkString:(NSString *)string {

    NSString *const expression = @"^\\d{3}[-]\\d{2}[-]\\d{4}$"; // insert yours
    NSError *error = nil;

    NSRegularExpression * const regExpr = 
    [NSRegularExpression regularExpressionWithPattern:expression 
                                options:NSRegularExpressionCaseInsensitive 
                                error:&error];

    NSTextCheckingResult * const matchResult = [regExpr firstMatchInString:string
                              options:0 range:NSMakeRange(0, [string length])];

   return matchResult ? YES : NO; 
}