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johanforssell/NSString+Filter

Created December 17, 2014 22:10
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NSString category for filtering text
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NSString+Filter
#import <Foundation/Foundation.h>
@interface NSString (Filter)
/// Only allow A-Z, a-z, 0-9 and underscore.
- (BOOL)isAlphanumericOrUnderscore;
@end
@implementation NSString (Filter)
- (BOOL)isAlphanumericOrUnderscore
{
NSMutableCharacterSet *set = [NSMutableCharacterSet alphanumericCharacterSet];
[set addCharactersInString:@"_"];
return ([self rangeOfCharacterFromSet:[set invertedSet]].location == NSNotFound);
}
@end
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