ios,regex,nsregularexpression , Regex in iOS to limit a text field to only letters and single apostrophies


Regex in iOS to limit a text field to only letters and single apostrophies

Question:

Tag: ios,regex,nsregularexpression

After a text field is returned I want to check if the text provided is valid. Valid means only letters or a single apostrophe, for names.

I'm pretty new to regular expressions. Is there a simple regular expression I can use for this check, or can someone point me towards some reading material where I can learn to compose a regular expression that will fit my needs?


Answer:

You can do it like this, but you need to show an error in case the input is invalid.

- (BOOL)textFieldShouldEndEditing:(UITextField *)aTextField
{
    NSString *const regularExpression = @"^[a-zA-Z']+$";
    NSError *error = NULL;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regularExpression
                                                                           options:kNilOptions
                                                                             error:&error];
    if (error) {
        // Handle error
    }

    NSUInteger numberOfMatches = [regex numberOfMatchesInString:aString
                                                        options:0
                                                          range:NSMakeRange(0, [aString length])];
    return numberOfMatches > 0;
}

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