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My code is below,but it doesn't work. 

NSString *regex = @"^#";

NSPredicate *regextest = [NSPredicate
                          predicateWithFormat:@"SELF MATCHES %@", regex];

if ([regextest evaluateWithObject:secondHalfString] == YES) {
    NSLog(@"Match!");
} else {
    NSLog(@"No match!");
}

Anything wrong?

Monolo
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Tom H
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3 Answers3

1

matches in a predicate works on the whole string, so to obtain what you are after, write the regex like this:

@"^#.*"
Monolo
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0

note that

The predicate format string syntax is different from the regular expression syntax.

on the Predicate documention.

for regex on cocoa look at this answer.

Community
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Ria
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0

If you are looking for a string that starts with a certain string you should use something like @"SELF BEGINSWITH #", it is much faster than using regular expressions.

hypercrypt
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