Validating user input from a regEx

Question

I have to validate phone no from following regEx.

//**regExpPattern** : "+?[0-9]{0,3}( |-)?[0-9]{4}( |-)?[0-9]{3}( |-)?[0-9]{3}"
-(BOOL) textFieldValidation:(NSString *)checkString withRegEx:(NSString*)regExpPattern
{
      NSString *stringToValidate = [[NSString alloc]initWithString:checkString];
      NSString *pattern = [[NSString alloc]initWithString:regExpPattern]
      NSLog(@"%@ %@",checkString,regExpPattern);


      NSPredicate *myTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",pattern];

            if ([myTest evaluateWithObject:stringToValidate]){
                return YES;
            }
            return FALSE;
        }

I'm getting the following exception :

'NSInvalidArgumentException' 'Can't do regex matching, reason: (Can't open pattern U_REGEX_RULE_SYNTAX (string 6789054321, pattern +[?][0-9]{0,3}( |-)?[0-9]{4}( |-)?[0-9]{3}( |-)?[0-9]{3}, case 0, canon 0))'

A simple one.. If this could help: iossnippet.com/snippets/validation/… — GenieWanted
– GenieWanted, Commented Nov 27, 2013 at 7:59

Me again · Accepted Answer · 2013-11-27 07:39:12Z

3

+ is a special character; you need to escape it (\+?) or use it properly (e.g. \s+? for leading spaces)

answered Nov 27, 2013 at 7:39

Me again

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Vizllx · Accepted Answer · 2013-11-27 07:55:25Z

0

Use the pattern like this

regExpPattern=@"(([+]{1}|[0]{2}){0,1}+[1]{1}){0,1}+[ ]{0,1}+(?:[-( ]{0,1}[0-9]{3}[-) ]{0,1}){0,1}+[ ]{0,1}+[0-9]{2,3}+[0-9- ]{4,8}";

answered Nov 27, 2013 at 7:55

Vizllx

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Comments

frank · Accepted Answer · 2015-10-28 13:19:17Z

0

I meet this problem too. '+' is indeed a meta character,you should understand why you use '+'.

If you want to match '+' like a normal character.then you should use '\+'.

If you treat the '+' like special character,want to match one other character.then you should add the character before '+',then it will not crash.

PS: in iOS predicate the 'like' and 'matches' do not conform same regex match rule!

edited Oct 28, 2015 at 13:19

answered Oct 28, 2015 at 12:16

frank

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